What is "kaskians"

The Kaska (also Kaška, later Tabalian Kasku and Gasga, ) were a loosely affiliated Bronze Age non-Indo-European tribal people, who spoke the unclassified Kaskian language and lived in mountainous Pontic Anatolia, known from Hittite sources. They lived in the mountainous region between the core Hittite region in eastern Anatolia and the Black Sea, and are cited as the reason that the later Hittite empire never extended northward to that area.