Suggestions by @jesselee

John Tartaglia

as Gonger in The Bert and Ernie Show (1994 - 2010)

Sutton Foster

as Mike The Ladybug in The Bert and Ernie Show (1994 - 2010)

Johnny Depp

as Placido Flamingo in The Bert and Ernie Show (1994 - 2010)

Ned Beatty

as Artie the Ant in The Bert and Ernie Show (1994 - 2010)

Blake Clark

as Randall The Zebra in The Bert and Ernie Show (1994 - 2010)

Jack Black

as Chuck The Lion in The Bert and Ernie Show (1994 - 2010)

Brian d'Arcy James

as Chicago The Lion in The Bert and Ernie Show (1994 - 2010)

Cliff Edwards

as Archie The Cricket in The Bert and Ernie Show (1994 - 2010)

Tony Jay

as Caterpillar (The Adventures Of Elmo In Grouchland) in The Bert and Ernie Show (1994 - 2010)

Daniel Breaker

as Gordon in The Bert and Ernie Show (1994 - 2010)

Jim Cummings

as Floyd Pepper in The Bert and Ernie Show (1994 - 2010)

Brendan Fraser

as Frazzle in The Bert and Ernie Show (1994 - 2010)

Wayne Allwine

as Zoot in The Bert and Ernie Show (1994 - 2010)

Frank Welker

as Herry Monster in The Bert and Ernie Show (1994 - 2010)

Will Smith

as Oscar in The Bert and Ernie Show (1994 - 2010)

Richard White (actor)

as Scooter in The Bert and Ernie Show (1994 - 2010)

Mel Brooks

as Animal in The Bert and Ernie Show (1994 - 2010)

Robin Williams

as Janice in The Bert and Ernie Show (1994 - 2010)

Alan Tudyk

as Dr. Teeth in The Bert and Ernie Show (1994 - 2010)

An Unknown Voice Actor

as Maggie Cadabby in The Bert and Ernie Show (1994 - 2010)