This is a slab vessel (actually two attached slab vessels) with a face modeled after the Kenner Wampa figure. The Wampa was the vicious humanoid monster from The Empire Strikes Back which was responsible for making Luke Skywalker's face slightly less pretty. It was barely shown in the original film, but given a little more screen time in the much reviled revised version from the late nineties. The face of the figure bares little resemblance to the monster in the film and I would like to reiterate that the face on the cup is based on the toy and not the on-screen wampa.
Kenner's Wampa figure:
