As part of its ongoing efforts to promote every single Pokémon out there, The Pokémon Company has shared special content dedicated to Tangela:
Did you know? Hidden beneath a tangle of vines that grows nonstop even if the vines are torn off, this Pokémon’s true appearance remains a mystery. The vines of a Tangela have a distinct scent. In some parts of Galar, Tangela vines are used as herbs.
Source: The Pokémon Company