Skullweeds!

Skullweeds are roughly crab-sized carnivores that dwelled on the planet where Crocazill and Skylla found themselves.

Their name comes from the obvious fact that they resemble human skulls with seaweed trailing behind them, which they use to camoflauge with the vegetation. Though formidable in packs they are hardly the planet's most dangerous predator...

I got the idea for these things in a dream. One was peeking out at me from a rock in a forest. It was my friend Joe's idea to make the teeth look a bit more like spider legs.