The white naga and white naga hatchling are members of the naga monster class, added in UnNetHack. They resist cold and poison damage, and their corpses convey the same resistances. The adult form has a cold-based spit attack.
Only the adult form is found randomly generated, in the ice-themed Sheol branch. Hatchlings can be hatched from eggs, however.
A user has suggested improving this page or section as follows:
"Is adult spit attack defective?"