Houndstongue

Houndstongue was the exonym given to Cootenga, the language of the Dogfolk. Despite being developed and spoken entirely in North America for a thousand years, it accepted virtually no loanwords, remaining a pure Celtic language.

Etymology and nomenclature
The word Cootenga is a combination of the words coo ("hound") from the Old Irish cú; and tenga, derived from the Old Irish tengae ("language, tongue"). The English word is thus a calque of the original.

"Coo" in this and all other cases refers specifically to the Wolfhound-like members of the Dogfolk tribe, as well as those first brought over by the Saint Brendan voyagers, and is identical to the modern with the Manx word for the same term. However, it is to be differentiated from the Houndstongue word for all other domesticated dogs, kee, from the Brythonic *ki, itself immediately cognate to the same word in Welsh, Cornish, and Breton.

History
It appears that the linguistic history of Houndstongue has two distinct phases: the first is the mutation of the Old Irish speech from the Saint Brendan settlers in the Sixth Century, and the second is the introduction of Middle Welsh from Prince Madoc's expeditions into the North American interior in the early Twelfth Century. Although it was reduced after the mid-Nineteenth Century (the death of Wanata) to a solitary speaker, Wanata's twin brother Wolkee, the ability to speak it remains latent with those humans who have latent Dogfolk genetics.