What is a niffin?

"Niffin" is not a recognized term in any major mythology, folklore, or literature. It's possible you're thinking of a similar word or have encountered it in a specific fictional context.

Here are some possibilities:

* "Niflheim" is a realm of frost and ice in Norse mythology. It is the realm of primordial cold and darkness, often associated with death and the underworld.

* "Niffler" is a magical creature from the Harry Potter universe. They are small, furry, and have a penchant for shiny objects.

* "Nif" could be a misspelling of a word. It's possible you're remembering a different creature entirely.

To help me figure out what you're thinking of, could you provide more context? For example:

* Where did you hear the term "niffin"?

* What was the context surrounding it?

* What other details do you remember about the "niffin"?

With more information, I can help you understand what you're looking for!