In the first trailer for Guardians of the Galaxy the Nova Corps profile on Groot lists his homeworld as "Taluhnia". However, in the film itself this has been changed to "Planet X" and the name "Taluhnia" never appears in any other published material.
However, in Marvel's Guardians of the Galaxy (video game) (2021), Peter Quill can use a broken translation device to begin a conversation, and Rocket will reveal, that Groot's language is actually "Taluhnisan". One also can view Groot's criminal file on a Nova Corps computer in the game, but there the planet is also called Planet-X.
