Frogoon

Frogoons are green frogs and enemies that appear in Donkey Kong Country Returns and Donkey Kong Country Returns 3D. Frogoons repeatedly jump up and down in one place. They can inflate their body while in midair to hover up slightly higher. Donkey Kong can easily subdue Frogoons by jumping on top of them, causing them to deflate and blow away offscreen. Frogoons often appear together in groups. If one looks closely, one can see that Frogoons sometimes try to catch and eat a small fly in-between jumps. They also have a yellow variant named Hopgoon.

In Mario Kart 7, Frogoons appear as obstacles on DK Jungle, which returns as a retro course in Mario Kart 8 and Mario Kart 8 Deluxe. Here, they do not inflate at all, and only jump across the road, thus acting like Hopgoons. They cause racers to spin out and lose three coins if bumped into, but can be temporarily repelled with offensive items such as Green Shells. Frogoons make two consecutive jumps before turning the other way in Mario Kart 7, while in the latter two games, they only jump once.

Frogoons do not appear in Donkey Kong Country: Tropical Freeze although a grasshopper enemy, Punchy Paddy, behaves very similarly to Frogoons.

Reference
Froschler