tjerna is the neuter plural definite of tjern.

tjernN

Kven

lompolaN; lompoloN

Norwegian Bokmål – Kvendict-nob-fkv/src/N_nobfkv.xml:30119Edit on GitHub Suggest

láttuN; ládduN

Norsk-nordsamisk ordbokdict-nob-sme/src/N_nobsme.xml:73726Edit on GitHub Suggest

Case	Sg	Pl
Indef	tjern	tjern
Def	tjernet	tjerna