Animaniacs is an american cartoon made for Fox Kids and Kids' WB, and there was a portuguese dub, but it there aren't lots of clips on the internet
There used to be other clips on internet, but they are gone
UPDATE 1: Yakko Warner told me if I give her the intro's lyrics, she would give me some episodes
UPDATE 2: The Episode 30 was found: https://drive.google.com/file/d/1xsrY1dxviO1K-TcucMqlKR9X7LrFZY6J/view?fbclid=IwAR3KnA0Gdp9mtB_xsQbh55-QQSycMQuB0P_JDIqv0iWxngvKdwNIagwjlfc
UPDATE 3: The Episode 31 was also found, but it is incomplete: https://drive.google.com/file/d/1gItpXkEjEUquN8-V-92uZ8G0NM3i9nEv/view?fbclid=IwAR3C9jfZS5t8ngZI5-tI14zLbkYK1IJRZg73RqzFhFxUadMwW-OlTMb2yIc
UPDATE 4: Another episode was (partially) found, and it's the 13th episode: https://drive.google.com/file/d/1d74t0LZTi4mswg2cKNdLrCe9gOR8N7nx/view?fbclid=IwAR2BJU6tALMM2DaNLEVGb-8CYLk7XWbTjVIS4c8zsuQApQjyRuZkB7WmztA, making one of the lost videos of the cartoon in portuguese being now found!