Bonehead Jed

Bonehead Jeds are enemies found in Donkey Kong Country Returns and Donkey Kong Country Returns 3D. They are found in the Cliff area of Donkey Kong Island. Bonehead Jeds are basically undead dinosaurs inside carts, but when Donkey Kong or Diddy Kong get close to them, they'll extend their heads in an attempt to attack the Kongs. The Kongs must stomp on their heads twice to defeat them; the first hit temporarily immobilizes them. Kong Rolls have no effect against them.

Some Bonehead Jeds can fire projectiles from their mouths, which damage the Kongs on contact. Most of these projectiles look like blobs of goop, but some of these enemies can shoot fireballs. The ones that shoot fireballs are known as Firehead Neds.

Reference
Knochenkopf-Karl