Ray Romano Manny (voice) John Leguizamo Sid (voice) Denis Leary Diego (voice) Queen Latifah Ellie (voice) Simon Pegg Buck (voice) Seann William Scott Crash (voice) Josh Peck Eddie (voice) Chris Wedge Scrat (voice) Karen Disher Scratte (voice) Kristen Wiig Pudgy Beaver Mom (voice) Harrison Fahn Glypto Boy (voice) Maile Flanagan Aardvark Mom (voice) Bill Hader Gazelle (voice) Kelly Keaton Molehog Mom / Shovelmouth Mom (voice) Joey King Beaver Girl (voice) Jane Lynch Diatryma Mom (voice) Clea Lewis Start Mom (voice) Carlos Saldanha Dinosaur Babies / Flightless Bird (voice) Claudia Besso Additional Voice (voice) Matt Adler Additional Voice (voice) Holly Dorff Additional Voice (voice) Nicole Ehinger Additional Voice (voice) Selenis Leyva Additional Voice (voice) David McCharen Additional Voice (voice) Devika Parikh Additional Voice (voice) Jake Schwencke Additional Voice (voice) Johnathan Tchaikovsky Additional Voice (voice) June Christopher Additional Voice (voice) Frank Welker Momma Dino (uncredited)