1986 Gnaw looks more like a Piranha than a shark. because the cartoon/toy design for Gnaw was fat+round & not extremly long like a skark. I wonder if hasbro changed the name of the piranha gnaw alt mode to make it seem more cool or fierce.
To be honest it looks more like a mutated frog than a piranha. Piranhas have a very special face and a monstrous underbite.
the TF Wiki has a bunch of hilarious quotes from Floro Dery as to the design process of the characters he made for the movie, such as this one for Arcee: "Arcee is the naked mechanical equivalent of Princess Leia of Star Wars." Quoting what they put in the Sharkticon entry: "* When asked about the Sharkticon design in an interview, Floro Dery's reply was, "Sharkticon is a shark." He's seen some pretty weird-ass sharks. "
Lol, yeah, but HUGE eyes and TINY limbs, he really is a freak, which is what makes him better than the boton repaint IMO