Malisk

they're an alien spore creature that devours everything before leaving to the next planet.
they have crab mandibles, so they only tear apart and pick things clean. they do not chew.

the jaw is unhingeable and the throat can expand like a frogs does (scales have membrane between them that can bulge out). also, they have an exoskeleton like a crab. just think of the skin the fur grows out of like the fuzz on deer antlers? easily scraped off but there's hard bone underneath it. pawpads work the same way.

oh and they just have fangs to hold onto prey, and flat front teeth to pull up grass/vegetation. inside the mouth and further down the throat are just mandibles that basically shred/pick apart whatever they ingest.