Knocka

Knockas are green lanky Kremlings who hide in green barrels with faces painted on them.

Donkey Kong Country 3: Dixie Kong's Double Trouble!
In Donkey Kong Country 3: Dixie Kong's Double Trouble!, Knockas make their debut. In this game, they are fairly common enemies, encountered in a large amount of levels. Knockas have an attack pattern similar to an earlier enemy named Klobber; a Knocka will wait hidden in its barrel, if Dixie and/or Kiddy pass by, a Klobber will spring forth out of its barrel and begin trying to ram the Kongs. Since a Klobber cannot directly hurt a Kong they will try and ram them into either another enemy or an abyss.

A Knocka can be defeated by simply jumping on it as this will knock it back into it's barrel. Once back in it's barrel a Knocka can simply be picked up and thrown away. In later levels of Donkey Kong Country 3, two barrel wearing sub-species of Knockas, Klasps and Kuchukas are encountered. Also in the Game Boy Advance remake of Donkey Kong Country 3 an explosive version of Knockas, TNT Knockas are present in the code for the game, but are not encountered in the game.

Donkey Kong Land III
In Donkey Kong Land III Knockas, along with Klasps and Kuchukas, are still semi-common enemies. The game erroneously lists Knockas as Krushas, however, yet aside from the name, there is no real difference between the Knockas of Donkey Kong Country 3 and Donkey Kong Land III.