Nebulan

Nebulans (or Nebulons) are the inhabitants of the planet Nebulos. They have found themselves involved with the Transformers in several different dimensions within the multiverse.

Their language is Nebulanese.

Decepticon World continuity
The Nebulans were a race of humans that had lived without war for thousands of years on their home planet of Nebulos. That peace was disrupted when a group of Autobots arrived seeking to relocate from their own war-torn world of Cybertron. This caused divisions amongst the Nebulans based on whether or not to trust the newcomers.

Generation 1 cartoon continuity
Nebulons were extremely human-like aliens who possessed green skin and dark green or white hair. Their facial features seemed to have tended towards a rather Native American cast. Some of the oldest of their ruling class, the Hive, appear to have had cyborg alterations or even taken on fully robotic bodies.

Nebulos was a world whose inhabitants were enslaved by the Hive, a group of eleven Nebulon telekinetics whose focus on development of their mental powers had caused their bodies to wither, led by Lord Zarak. The populace was mainly forced to do routine farm work, watched over by the machines which the Hive controlled telepathically.