Venus Trap Platform
From the Super Mario Wiki, the Mario encyclopedia
Venus Trap Platforms are carnivorous plants from Donkey Kong Country: Tropical Freeze. They grow upside down and are supported by a coiled, flexible stem, which allows them to drop down and hunt smaller creatures, then quickly return to their normal position. Their prey includes ground-walking enemies, as well as the Kongs, and will attack whenever they spot these beneath them, producing harm.
Venus Trap Platforms can be avoided as they descend to attack, but cannot be destroyed. The base of their green, pear-shaped heads is coated with a leaf crown, which serves as a platform. The Kongs can quickly mount the plant while it is close to the ground an be lifted to higher areas as it rises back.