Frank Oz
Miss Piggy's personality and voice were seen and heard in other female characters performed by Frank Oz before the character's debut. For instance, a "Sesame Street" Muppet skit from 1971 featured Snow White performed by Frank Oz and acting (as well as sounding) like Miss Piggy. Another sound-alike came from a contestant in a Guy Smiley sketch called "The Mystery Mix-Up Game".