A beaver type animal called a coi pew?

There is no known animal called a "coi pew." It's possible this is a misspelling or a fictional creature.

Could you please double-check the spelling or provide more context about where you encountered this term?

Perhaps you were thinking of:

* Coypu: A large rodent native to South America, sometimes called a "river rat" or "nutria."

* Capybara: The world's largest rodent, native to South America.

Let me know if you have more information, and I'll do my best to help you find the animal you're looking for!