Gudgeon
/ˈɡʌdʒən/
noun
A small freshwater fish, Gobio gobio, that is native to Eurasia.
Any of various similar small fish of the family Eleotridae, often used as bait.
A person apt to take the bait; one easily cheated or duped; also, an idiot.
Synonyms: goby, wapper, sleeper goby
verb
To deprive (someone) fraudulently; to cheat, to dupe.
To take the bait; to be defrauded or duped.