Northern Frisian (3283-frr) = Threatened (80 percent certain, based on the evidence available) (Language use is most active on western Föhr and in the village of Risum-Lindholm on the mainland. A small number of children learn the language, but few of them continue to use it in adulthood. Most idiolects are heavily influenced by Low Saxon and German.)
Glottolog
[frr] at ISO 639-3
[frr] at OLAC
[frr] at IMTVault
Frisian (North) at WALS
Northern Frisian at Endangered Languages Project
Wikipedia
PHOIBLE
Wikidata