1) Ass 2) Bozo 3) Cuckoo 4) Goof 5) Goofball 6) Jackass 7) Twat 1) Bozo 2) Craze has articles for fool 3) Cuckoo 4) Dolt 5) Dummy 6) Fool 7) Goof 8) Goofball 9) Goose 10) Incompetent fool 11) Jackass 12) Muggins 13) Ninny 14) Numskull 15) Saphead 16) Slangy term of opprobrium 17) Stupid person 18) Tomfool 19) Twat 20) Zany 
• (n.) A labroid food fish of California; the redfish. • (n.) A cyprinoid fish of the Mississippi valley (Pimephales promelas); -- called also black-headed minnow.
Fat'head` noun (Zoology) (a) A cyprinoid fish of the Mississippi valley ( Pimephales promelas ); -- called also black-headed minnow . (b) A labroid food fish of California; the redfish. 
Fathead is British slang for a fool, an idiot.
[n] - a man who is a stupid fool
A saltwater fish belonging to the wrasse family. Also called 'California sheepshead.' Its meat is white, tender, and lean. 
goof noun a man who is a stupid incompetent fool