There is no direct translation of "pooka" in Polish. However, you might use the following terms to convey a similar meaning:
* "Skrzat" - This translates to "goblin" or "elf" and refers to a small, mischievous creature that inhabits forests and fields.
* "Duszek" - This means "spirit" or "ghost" and can be used to refer to a playful or mischievous supernatural being.
* "Wróżka" - This translates to "fairy" and can be used to describe a supernatural being with magical powers.
The best word to use would depend on the specific context of the pooka you are trying to describe.