From English - German Ding/FreeDict dictionary ver. 1.9-fd1:
schnook /ʃnˈʊk/
[Am.] Dummkopf <masc>, Schwachkopf <masc>, Schwachmat <masc>, Hohlkopf <masc>, Hohlbirne <fem>, Blödian <masc>, Esel <masc>, Hornochse <masc>, Dussel <masc> [Dt.] , Dämlack <masc> [Dt.] , Doofmann <masc> [Norddt.] [Mittelwestdt.] , Döskopp <masc> [Norddt.] [Mittelwestdt.] , Dösbattel <masc> [Norddt.] [Mittelwestdt.] , Dämel <masc> [Norddt.] [Mittelwestdt.] , Dämlack <masc> [Norddt.] [Mittelostdt.] , Dummerjan <masc> [Norddt.] [Mitteldt.] , Spacken <masc>, Dödel <neut> [Mitteldt.] [BW] , Depp <masc> [Süddt.] [Ös.] [Schw.] , Dummian <masc> [Bayr.] [Ös.] , Dodel <masc> [Ös.] , Dulle <masc> [Südostös.] , Wappler <masc> [Ös.] , Hiefler <masc> [Ös.] , Tubel <masc> [Schw.] , Dubel <masc> [Schw.] , Tschumpel <masc> [Schw.] , Lööli <masc> [Schw.] , Nullchecker <masc> [Jugendsprache] , Narr <masc> [geh.] [veraltend] , Tor <masc> [poet.] [obs.] [pej.]
Synonyms: fool, jerk, airhead, clod, clodhopper, dimwit, nitwit, halfwit, loon, dolt, clot, charlie, plonker, prat, boob, poop, schmuck, gump ninny, tomfool
see: fools, jerks, airheads, clods, clodhoppers, dimwits, nitwits, halfwits, loons, dolts, clots, charlies, plonkers, prats, boobs, poops, schnooks, schmucks, gump ninnies, tomfools, Fools rush in where angels fear to tread., Fools rush in!