Conversation so far:
When did The Muppet Show first air?
She spawned a huge fad during the late 1970s.
What was this fad like?
Miss Piggy's personality and voice were seen and heard in other female characters performed by Frank Oz before the character's debut.
Who voiced Miss Piggy?
CANNOTANSWER.
What was the show about?
CANNOTANSWER.

Question: What else can you tell me about Miss Piggy's role?
Self-contained rewrite: Besides the late 1970s fad, and her personality and voice performed by Frank Oz, what else can you tell me about Miss Piggy's role?