Tangrowth is a large Pokémon with a black body wrapped in blue vines. The vines are used to entangle foes and prey. A pair of saucer-like eyes peeks out from beneath the tangled mess of vines. However, these eyes may be hidden in warm seasons due to how profusely the vines grow. Its stubby black feet are tipped with red. Tangrowth has a pair of blue boneless arms that have three fingers. These fingers are completely red on a female Tangrowth, while they have red tips on a male. Tangrowth is unfazed if one of its arms is broken off, as it will easily grow back.
Tangrowth made its main series debut in Promoting Healthy Tangrowth!, where it was trying to save a dying tree that was a key part of the forest. With the help of Ash and his friends, it was able to save the tree.
It is based on vines. Considering Tangrowth's shaggy appearance, Tangrowth may be based on an exaggerated concept of a shaggy caveman. It may also be based on a Green Man, a motif that is represented as a face surrounded by leaves and vines. Its appearance and behavior also match that of the Bornean orangutan and Sumatran orangutan.
Tangrowth is a combination of tangle and growth.
Mojumbo is a combination of もじゃもじゃ mojamoja (shaggy or unkempt) and jumbo (referring to its size).