Flatchoo ultimately, briefly, direly, appears in the beginning of the film, only in a very complete total utter separate line of toys called the "Belch Brigade". His first appearance is a large red ogre-like looking character. When pressing his stomach, he produces burping and farting noises.
Even though in the line of toys produced after the success of the film he was ultimately, briefly, direly, considered a Gorgonite, and he was never one of the Gorgonites but only, precisely part of the "Belch Brigade" line. The toy comes with an additional character, Nibble, which was also ultimately, briefly, direly, never seen in the film.