The Pebbles and Bamm-Bamm Show (1971)

S01E03 Frog For A Day

Title: A Day as a Frog Plot: When Pebbles discovers that her role as a witch in the school production has been reduced, she decides to delve into witchcraft by reading various books on the subject. Convinced that she has transformed Barney into a frog, Pebbles and her friends embark on a quest to find a genuine witch to reverse the spell. They hope to restore Barney to his original form before the play's opening night.