I disagree about Jo’ Mamma being of a separate “shape”. On the composition Xav posted, compare the jaws and hunchbacks of Jo’ Mamma and Nilsworth O’Shafster. It’s a shared trait amongst all those of the “horned” variety. The same applies to the Nailers.
Now try comparing the “yellowheads” with Wolvarks. Hmmm, interbreeding, anyone?
There is a fifth type, which was never seen in the game.
