Ferrothorn

Ferrothorn is the Thorn Pod Pokémon, a Grass/Steel-type whose body is covered in spikes harder than steel, allowing it to anchor itself to rock walls by stabbing its feelers into the stone. It typically hangs from cave ceilings or cliff faces, defending itself by flailing its barbed feelers at anything that approaches. It evolves from Ferroseed, and its defensive bulk and resistances make it a notable presence in competitive play despite its sluggish, immobile nature.

The Japanese name ナットレイ (Nattorei) is generally understood to combine 'nut' (ナット, natto—the borrowed English word for the fastener) with possible references to 'natto' (納豆, fermented soybeans) and 'rei' which may evoke 'thread/threads' or a vine-like quality; the imagery centers on a spiky nut-like body trailing feelers. The English name 'Ferrothorn' fuses the Latin 'ferro-' (meaning iron, as in ferrous/ferric) with 'thorn,' directly reflecting its Grass/Steel typing and its steel-hard spikes.