The Whomping Willow is a foundable in Harry Potter: Wizards Unite and can be found in the Wonders of the Wizarding World registry. It has a emergency threat level.
Summary
The Whomping Willow is a particularly violent tree planted on the grounds of Hogwarts. Its limbs attack anything that crosses its path, and it was planted right over a secret passage to the Shrieking Shack in Hogsmeade.