Tangrowth serves as the environmental researcher called Professor Tangrowth in Pokémon Pokopia.
Early in the story, Ditto encounters Professor Tangrowth in the abandoned Kanto setting. This character has taken responsibility for studying the damaged environment and investigating why humans and Pokémon left. Professor Tangrowth therefore helps connect the game’s rebuilding activities with its larger mystery.
The name is a direct character title built from the Pokémon’s species name. Tangrowth is a Grass-type Pokémon introduced in Generation IV, while Professor Tangrowth is the specific story character appearing in Pokopia. The title does not mean that the player controls Tangrowth; the player controls Ditto.
Professor Tangrowth is also distinct from other named special Pokémon in the game, including Peakychu, Smearguru, Mosslax, Chef Dente, DJ Rotom, and Tinkmaster. Those characters have different identities and roles, whereas Professor Tangrowth acts as a researcher and narrative guide.