1941 Dub :

Voice Cast :

Character's Name	Voice Actor
Bambi	? (young) ? (adult)
Thumper ​Tambor	Pery Riberio (young) ? (adult)
Flower Flôr	Oscar Nobre (young) ? (adult)
Faline ​Feline	? (young) Dalva de Oliveria (adult)
Bambi's Mother Mãe de Bambi	​?
The Great Prince of the Forest ​Pai do Bambi	?
Friend Owl Coruja	?
Thumper's Mother Mãe do Tambor	​?
Faline's Mother Mãe da Feline	?

Additional Voices :

Henrique Foréis Domingues "Almirante" Olga Nobre Sara Nobre ​Oscar Nobre Yara Salles

Technical Credits :

Occupation	Person's Name
Director Direção	Carlos Alberto Ferreira Braga "João de Barro"
Translation ​Tradução	Gilberto Souto
Musical Director Direção Musical	Songs not Translated
Lyricist ​Letras	Songs not Translated
Sound Engineer Técnico do Som	Robert Cavalier Darbilly
Creative Supervisor Supervisão da Dublagem	Jack Cutting
​Dubbing Studio Estúdio de Dublagem	Sonofilms
Distribution	​RKO Filmes

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1969 Dub :

Voice Cast :

Character's Name	Voice Actor
Bambi	Maria Manoela (young) Otávio Pasaoli Jr. (adult)
Thumper ​Tambor	​​​Antonieta Matos (young) Cleonir dos Santos (adult)
Flower Flôr	Otávio Zordan (young) Fernando Resky (adult)
Faline ​Feline	Nair Amorim  ​(young & adult)
Bambi's Mother Mãe de Bambi	Amélia Simone
The Great Prince of the Forest ​Pai do Bambi	Luiz Motta
Friend Owl Coruja	Orlando Drummond
Thumper's Mother Mãe do Tambor	Olga Nobre
Faline's Mother Mãe da Feline	Selma Lopes

Additional Voices :

Selma Lopes (Pheasant, Raccoon, Opossum) Therezinha Moreira (Pheasant, Raccoon, Rabbit) Navarro de Andrade (Squirrel) Paulo Pereira (Frog) Márcio de Moura (Rabbit #1) Soria X.B. Macedo (Rabbit #2) Ricardo Kumstat (Child)

Songs :

Song Title	Singer(s)
Love is a Song O amor é uma canção	Coro de ​Roberto de Regina
Little April Showers Chuvinha de Abril	Coro de ​Roberto de Regina
Let's Sing a Gay Little Spring Song Cantemos uma alegre cançãozinha primaveril	Coro de ​Roberto de Regina
I Bring You a Song (Looking for Romance) Eu sou a canção	Coro de ​Roberto de Regina

Technical Credits :

Occupation	Person's Name
Director ​Direção	​Telmo Perle Münch
Translation ​Tradução	Telmo Perle Münch
Musical Director ​Direção Musical	​Roberto de Regina
Lyricist ​Letras	Aloysio de Oliveira
Sound Engineer ​Técnico do Som	Carlos de la Riva
Creative Supervisor ​Supervisão da Dublagem	Eugene Armstrong Shari Bescon
Dubbing Studio Estúdio de Dublagem	Rivaton - Rio de Janeiro
Distribution	Rank Filmes

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1993 Dub :

1994 VHS Release :

2005 VHS Release :

Blu-Ray Credits :

Transcription :

Character's Name	Voice Actor
Bambi	Diego Larréa (infant) Peterson Adriano (young) José Leonardo (adult)
Thumper ​Tambor	Patrick de Oliveira​ (young) Nizo Neto​ (adult)
Flower Flôr	Marcos de Souza​ (young) Pedro Eugênio​ (adult)
Faline ​Feline	Adriana Torres​ (young) Sílvia Goiabeira​ (adult)
Bambi's Mother Mãe de Bambi	Juraciara Diácovo
The Great Prince of the Forest ​Pai do Bambi	Jorgeh Ramos
Friend Owl Coruja	Pietro Mário
Thumper's Mother Mãe do Tambor	Isis Koschdoski
Faline's Mother Mãe da Feline	?

Chorus :

Paulo Queiroz Lilly Abreu ​Marcelo Coutinho

Songs :

Song Title	Singer(s)
Love is a Song O amor é uma canção	​Paulo Queiroz
Little April Showers Chuvinha de Abril	Paulo Queiroz Lilly Abreu ​Marcelo Coutinho
Let's Sing a Gay Little Spring Song Cantemos uma alegre cançãozinha primaveril	Paulo Queiroz Lilly Abreu ​Marcelo Coutinho
I Bring You a Song (Looking for Romance) Eu sou a canção	Paulo Queiroz Lilly Abreu ​Marcelo Coutinho

Technical Credits :

Occupation	Person's Name
Director Direção	Telmo Perle Münch
Translation Tradução	Telmo Perle Münch
​Musical Director Direção Musical	Marcelo Coutinho
Lyricist ​Letras	Aloysio de Oliveira
Choral Director Regência	Marcelo Coutinho
​Sound Engineer ​Engenheiro de Som	Carlos de la Riva
Recording Technician ​Técnico de Gravação	Luiz Guilherme d'Orey
Recording Assistants Assistentes	Marcelo Seródio ​Billy
Dubbing Studio ​Gravação	​Delart (dialogues) Som Livre (songs)

Sources :
1941 Dub :
Newspapers

1969 Dub :
A Memória da Dublagem

1993 Dub :
Brazilian 2005 VHS Release
Hong Kong Blu-Ray Release

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Trivia : 

• This film was dubbed into Brazilian Portuguese three times. Once in 1941, again in 1969, and again for the final cinema re-release in 1993.
• The 1941 dub started recording in 1941 while the Brazilian dubbings of Dumbo and The Reluctant Dragon were also in production. The 1941 dub did not premiere in Rio de Janeiro until 1943.
• Pery Riberio is the son of Dalva de Oliveira (first Brazilian voice of Snow White) and was four years old when recording his lines as Young Thumper in the first dubbing. While recording his dialogue for Young Thumper, there was no air conditioning in the recording studio. He was anxious of the heat, so he asked to remove his clothes gradually until he was completely naked. (Source : Pery Riberio's autobiography Minhas Duas Estrelas)
• Most of the casting information of the first dub has become lost as they were not documented often in the press. Only fragments of the first casts have been uncovered in newspaper articles from around the time. The second dub's cast was included on the back of the film's poster.
• The 1941 dub left the songs in English.
• All Brazilian releases have the 1993 dub on VHS / DVD / Blu-Ray.
• The 1994 Brazilian VHS release left the titles in English. The Brazilian Portuguese translated titles were included on the 1994 Portugal VHS and the 2005 Brazilian VHS.
• The 1941 dub is completely lost. The 1969 dub was issued in fragments on a Portugal LP record containing the songs and some dialogues from the film.
• The 1993 dub reused the translation and lyrics from the 1969 dub. It is unclear why the film was redubbed in 1993. A possibility is that Disney did not like the idea that Young Thumper was dubbed by a woman and wanted the character to be dubbed by a boy (like the original English version.)
• Shari Bescos was the Disneyland ambassador during 1969. She was invited to witness a recording session of the 1969 dubbing of Bambi in Rio de Janeiro. She met Otávio Zordan (Young Flower) who was enthusiastic to show her how the recording works. As she didn't speak Portuguese, she had an interpreter translate for her. Bambi was the only Brazilian dub she supervised. In the interview, she mixed up Young Thumper with Young Flower as she refers to a young boy and Young Flower was dubbed by a boy whereas Young Thumper was dubbed by a girl. (Source : Shari Bescos interview timestamp 10:30 - 12:13)  
• Due to the formatting of the Blu-Ray credits, Aloysio de Oliveira is credited as a singer when in reality, he was the lyricist.
• Portugal would use the 1993 dubbing for the first VHS release. They would use this dub until a European Portuguese dubbing was commissioned by Disney Character Voices International. 

1993 Reissue Poster

I would like to thank Leonardo Forli and Street Rat for supplying information and materials for this entry ! :)