Nar Phu

Nar Phu, or ’Narpa, is a Sino-Tibetan variety spoken in the two villages of Nar and Phu, in the Valley of the Nar Khola in the Manang district of Nepal. It forms a dialect continuum with Manang and may be intelligible with it; however, the Nar and Phu share a secret language to confound Gyasumdo and Manang who would otherwise understand them.

From Wikipedia · Nar Phu language · CC BY-SA 4.0