Check out this fun mash-up custom by Reverend Terry Rice (aka Orville Dunworth).
I always thought it was brilliant how so many characters could be created using the exact same parts and a new coat of paint. As a kid I found it hilarious that the smelly character (Stinkor) was a repaint of the fish character (Mer-Man). I would joke that Mer-Man was left out too long and went bad. Not to mention the built in pun “something smells fishy”. So these two were an obvious choice when I decided to do a two headed figure. I bring you “Stink-Fish”.