Infelizmente, não parece ter um nome, além de "Niffler" ou "The Niffler" (dependendo da perspectiva de quem estamos procurando).
As Newt looks up toward Mary Lou, something seen from the corner of his eye catches his attention. The Niffler, a small, furry black cross between a mole and a duck-billed platypus, is sitting on the steps of the bank, hastily pulling the beggar’s hat full of money out of sight behind a pillar.
NEWT: [annoyed] Bugger — Niffler’s gone. Of course he has, little bugger. Any chance to get his hands on something shiny.