I just downloaded the US Tamagotchi PC game from 1997 and dug into the HLP files to see if the voice actors in the game were credited. Mostly I was just interested in if the Tamagotchi had the same voice actors in the game as in Tamagotchi Video Adventures. I did find the voice acting list and it looks like at least some of the actors reprised their roles from the cartoon, including Frank Welker as Maskutchi. (Tom Kenny, who I suspect played Mimitchi in the cartoon, is notably absent from the game. I'll have to compare both sets of credits sometime.)
Is there a way to find out who voiced which tama? I read somewhere that Frank Welker voiced Maskutchi but I'm not sure about the others.
Here is the voice list:
Voice Talent:
Charlie Adler, Cam Clarke, Susan Deming, Pat Fraley, David Lewman, Candi Milo, Russi Taylor, Frank W. Welker
Additional Voices:
Alan Botvinick, Vahag Byurat, Jeanna Crawford, Andrew Hinnebush, Robin Hinnen, Michelle Italiano, Wendy Jacobsmeyer, Tina Lerno, Michael Lynch, Jonathan Pekar, Michael Reed, Jeffrey Steefel, Janice Tanaka