Octarian (language)
From Inkipedia, the Splatoon wiki
Octarians have a language different to that on the Inklings. Seen in Octo Canyon and Octo Valley, this language is written in square script mostly yet this is not the case consistently. Spoken Octarian varies in sound by different subspecies: Octotroopers and other enemy Octarians make noises similar to that of a hurt Inkling or Octoling, whereas Octolings speak in a high
