Wikipedia
The Armeno-Phrygians are a hypothetical people who, according to a some scholars, lived in the Armenian Highland as a group and then have separated to form the Phrygians and the Mushki of Cappadocia. It is also used for the language they are spoken. It can also be used for a language branch including these languages, a branch of the Indo-European family or a sub-branch of the proposed Graeco-Armeno-Aryan or Armeno-Aryan branch. Classification is difficult because little is known of Phrygian and virtually nothing of Mushki, while Proto-Armenian arguably forms a subgroup with Greek, and Indo-Iranian.
Note that the name Mushki is applied to different peoples by different sources and at different times. It can mean the Phrygians (in Assyrian sources) or Proto-Armenians as well as the Mushki of Cappadocia, or all three, in which case it is synonymous with Armeno-Phrygian.