johny crapaud

from The Collaborative International Dictionary of English v.0.48

Johnny \John"ny\, n.; pl. {Johnnies}.
   1. A familiar diminutive of {John}.
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   2. (Zool.) A sculpin. [Local cant]
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   {Johny Crapaud}, a jocose designation of a Frenchman, or of
      the French people, collectively.
      [1913 Webster]