Source : Webster's Revised Unabridged Dictionary (1913)

Johnny \John"ny\, n.; pl. {Johnnies}.
   1. A familiar diminutive of {John}.

   2. (Zo["o]l.) A sculpin. [Local cant]

   {Johny Crapaud}, a jocose designation of a Frenchman, or of
      the French people, collectively.