A porli was a type of bird native to the planet Bajor.
History and specifics
In 2318, Jas Holza hoped that the Cardassians didn't view the Bajorans as porli after he compared them to grass vipers. (TLE - Terok Nor novel: Day of the Vipers)
In 2376, refrigerated porli was found in a refrigeration unit that Iliana Ghemor's mercenaries obtained during a pirate raid. (DS9 novel: The Soul Key)