First portrayal of Trooibossa, by PokeCommunity user @gimmepie

Trooibossa is an original Suocéverse Pokémon.
It's a Grass/Flying type Pokémon based on prehistoric raptors and the evolved form of Teroraga.

Trooibossa is Teroraga's evolved morph, and it switches from the modern avian body plan to a prehistoric raptor-like structure with a horizontal body, clawed wings and a long tail. They are noticeably larger in size than Teroraga. They are capable of gliding and of climbing tree bark and similar surfaces. They have wider beaks, still curved at the tip, a larger and rounder head and an elongated torso.

Teroraga is the base morph. For more general information on this evolutionary line check Teroraga.