Armeno-Phrygian is a term for a minority supported claim of hypothetical people who are thought to have 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 assumed to have 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.