<P> Several Muppets made guest appearances including Janice as an older preteen, and Kermit's nephew, Robin, a young tadpole . </P> <P> The Muppet Baby character Skeeter, Scooter's twin sister, only appeared in this series, and was never a live - action Muppet . This was done because the producers wanted another female character added to the cast . Despite this, Skeeter was always voiced by a male actor (first Howie Mandel, and later Frank Welker). </P> <Ul> <Li> Greg Berg--Baby Fozzie, Baby Scooter, Dr. Julius Strangepork (archive footage, ep. 107) </Li> <Li> Barbara Billingsley--Nanny </Li> <Li> Dave Coulier (1986--1991)--Baby Animal, Baby Bunsen, Baby Bean Bunny, Baby Janice, Uncle Statler and Waldorf, Camilla (occasionally), Himself (ep. 91) </Li> <Li> Katie Leigh--Baby Rowlf, Mrs. Mitchell </Li> <Li> Howie Mandel (1984--1985)--Baby Skeeter, Baby Animal, Baby Bunsen </Li> <Li> Laurie O'Brien--Baby Piggy </Li> <Li> Russi Taylor--Baby Gonzo, Baby Robin, Aunt Fanny, and Camilla (occasionally) </Li> <Li> Frank Welker--Baby Kermit, Baby Beaker, Baby Skeeter (1986--1991), Camilla, Irma / Charlie (ep. 12), The Chief Inspector of Scotland Yard (ep. 31), Polly the parrot (ep. 38), Adult Kermit (looped dialogue, ep. 45), Bosko the Snowman (ep. 100) </Li> </Ul> <Li> Greg Berg--Baby Fozzie, Baby Scooter, Dr. Julius Strangepork (archive footage, ep. 107) </Li>

Who does the voice of nanny on muppet babies