It's probably a spirit! I asked my halmeoni but she didn't recognize it to be a specific creature she knew, so the author probably just created a nature spirit/imp based off of general shaman tales.
WHAHAHAHHAHAAHAHAHAHHAHHAHAHAHAHAHHAAHHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHHAHAHAHHAHAHAHHAHAHAHAHAHAHAHAHAHAH!! ..... HOOooooo.. that a good laugh ƪ(˘⌣˘)ʃ
I CALL DIBS ON BITCH EYES