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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Potsie, to the Fonz 4 letters:

NERD: Potsie, to the Fonz
NERDS: Ralph and Potsie, to the Fonz
RICHIE: Pal of Potsie and the Fonz