Peter Cottontail Sr.'s wife was never refer to by name. She is possibly Donna from the original TV movie.
Tom Kenny (Peter Cottontail, Junior and Antoine), Miranda Cosgrove (Munch) and Kenan Thompson (Flutter) are/were in various Nickelodeon shows. Kenny in "Spongebob Squarepants" (1999-present) and "CatDog" (1998-2005), Cosgrove in "Drake and Josh" (2004-2007) and "iCarly" (2007-2012) and Thompson in "All That" (1994-2000) and "Kenan & Kel" (1996-2000).