tassen is the masculine singular definite of tass.

tassN

Kven

(labb)käpäläN; käpäletN

Norwegian Bokmål – Kvendict-nob-fkv/src/N_nobfkv.xml:41522Edit on GitHub Suggest

Case	Sg	Pl
Indef	tass	tasser
Def	tassen	tassene