A fernduck is a mythical creature. When drawn by a three-year old a fernduck resembles a cross between a penguin and a duck. Fernducks have the tuxedoed look of penguins except that fernducks wear multi-colored coats. (Scott and Jim B.) Example: That's not a penguin, that's a fernduck.
FERNDUCK
Meaning of FERNDUCK in English
Slang English vocab. Английский сленговый словарь. 2012