This is a misspelling for naHjej. It appears in both K-E and E-K side of the word list of KGT, but as it is explained as literally "sharp fruit" in the main body (p. 88), naH + jej is definitely the correct version.
Cite this entry
Definition of {neHjej}
from the Klingon Language Wiki:
https://klingon.wiki/Word/NeHjej
Retrieved 29 Mar 2023