We found one dictionary that defines the word fool's fool:

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1. fool's fool: Wiktionary

Definitions from Wiktionary (fool's fool) ▸ noun:  An utter fool; a very foolish person. ▸ Words similar to fool's fool ▸ Usage examples for fool's fool ▸ Idioms related to fool's fool ▸ Wikipedia articles (New!) ▸ Words that often appear near fool's fool ▸ Rhymes of fool's fool ▸ Invented words related to fool's fool