These are referered as Vorpal Bunnies in the manual, but a related question to Leshy within the game, refers to them as Killer Rabbits. Killer Rabbits was also a concept name for the mosnter. They are referred to as 'rabbits' or 'bunnies' in the game's narration. The name "vorpal" comes from the Lewis Carroll poem Jabberwocky, while the rabbit itself is inspired by the Rabbit of Caerbannog from Monty Python and the Holy Grail.