Suggestions by @devlinclements

Uncle Dan (Migration)

as John Goodman in Roles That Actors / Actresses Were ALMOST Casted

Pam Mallard (Migration)

as Scarlett Johansson in Roles That Actors / Actresses Were ALMOST Casted

Mack Mallard (Migration)

as Elijah Wood in Roles That Actors / Actresses Were ALMOST Casted

Sarabi

as Jane Fonda in Roles That Actors / Actresses Were ALMOST Casted

Zazu

as Rik Mayall in Roles That Actors / Actresses Were ALMOST Casted

Timon

as Billy Crystal in Roles That Actors / Actresses Were ALMOST Casted

Nala

as Teri Hatcher in Roles That Actors / Actresses Were ALMOST Casted

Scar (Disney)

as Derek Jacobi in Roles That Actors / Actresses Were ALMOST Casted

Queen Gnorga

as Julie Andrews in Roles That Actors / Actresses Were ALMOST Casted

Stanley the Troll

as Robin Williams in Roles That Actors / Actresses Were ALMOST Casted

JoJo McDodd

as Michael Cera in Roles That Actors / Actresses Were ALMOST Casted

Sour Kangaroo

as Michelle Pfeiffer in Roles That Actors / Actresses Were ALMOST Casted

Horton Hears a Who!

as David Spade in Roles That Actors / Actresses Were ALMOST Casted

Dr. Glickenstein (Igor)

as Christopher Lee in Roles That Actors / Actresses Were ALMOST Casted

King Malbert (Igor)

as Fred Willard in Roles That Actors / Actresses Were ALMOST Casted

Dr. Schadenfreude

as Eric Idle in Roles That Actors / Actresses Were ALMOST Casted

Brain (Igor)

as Matthew Broderick in Roles That Actors / Actresses Were ALMOST Casted

Eva (Igor)

as Jennifer Connelly in Roles That Actors / Actresses Were ALMOST Casted

Zipporah

as Jennifer Jason Leigh in Roles That Actors / Actresses Were ALMOST Casted

Aaron (The Prince of Egypt)

as Steve Buscemi in Roles That Actors / Actresses Were ALMOST Casted