What is the name of the Tangrowth who studies the environment in Pokémon Pokopia?

The Tangrowth who studies the environment in Pokémon Pokopia is called Professor Tangrowth.

After Ditto assumes a human-like form, it meets this Tangrowth in the abandoned world. Professor Tangrowth has taken responsibility for studying the damaged environment and investigating the mystery of why humans and Pokémon disappeared. The character therefore serves both as a story guide and as a source of information about the setting.

The title is a playful variation on the professor tradition established throughout the Pokémon series. In many mainline games, a human professor introduces the player to the region and its research. Pokopia instead places a Pokémon scientist in that role, matching the game's premise that Pokémon are rebuilding life after the humans are gone.

Professor Tangrowth is not Professor Oak or another human researcher. The name identifies both the character's species and its in-game title, making the answer more specific than simply “Tangrowth.”