Watch The Giant Horny Toad Monster Full Movie Free Online 123Movies. Half-Horny Toad, Half-Man! SEE "Horny Toad Man" Run AMOK & Wreak HAVOC! Starring B-Monster moviemaker & actor David Rock Nelson in a Triple-role as The MAD Dr, Horny Toad Man & as Detective ROCK. Also starring his late Dad as his fellow detective, David's Mom as herself, his brother as a hapless victim of The Monster, his girlfriend as the girl in the diner & her little cat "BOO"! Special appearances by late "Ghost hunter"/author Richard T. Crowe & Pres. of Chicago "Psychotronic Film Society" Mike Flores.