
Quick answer — Etsuko Kozakura voices Tamama in Sgt. Frog, Youhei Yamada in Chi's Sweet Home, Pocchama in Pokémon the Series: Diamond and Pearl and 14 more characters.
Etsuko Kozakura voices Tamama (Sgt. Frog), Youhei Yamada (Chi's Sweet Home), Pocchama (Pokémon the Series: Diamond and Pearl), Jibanyan (Yo-kai Watch), Mimiko Sakura (Shin Chan), Jonathan (Kaleido Star), Pinocchimon (Digimon: Digital Monsters), Suzuki (Okko's Inn) and 9 more.
Tamama is voiced in Japanese by Etsuko Kozakura.