Koin

Koins are Kremlings encountered in every level of the games Donkey Kong Country 3: Dixie Kong's Double Trouble and Donkey Kong Land III. Koins wear buckets on their head and carry a shield which has a DK Coin attached to it.

Description
If the Kongs approach a Koin, he will simply bash them away; if they attempt to jump on him he will simply raise his shield and block the jump. Koins are immune to almost any kind of attack. Even TNT Barrels are useless against them. Fortunately, Dixie Kong and/or Kiddy Kong can defeat a Koin by using a Steel Keg. They have to throw the Steel Keg over him, which will then rebound off a wall (sometimes the Kongs must find another way to defeat Koin using the Steel Keg) and hit Koin in the back, defeating him and giving Dixie and Diddy a DK Coin as reward. Most of the time, Koins are usually found near the beginning or the end of the level.

On a side note, in Donkey Kong Country 3, some Koins can only be defeated with the assistance of a Kremling enemy named Bazuka. In some levels, the Steel Keg required to defeat Koin is obtained by bringing an Animal Buddy past the No Animal Sign. In these cases, the Kongs only get one chance to defeat Koin; if they fail, they must replay the entire level to get another chance.

A purple-ish version of Koin called Koindozer is encountered in the level "Koindozer Klamber". Koindozers are much more aggressive than their green brethren, chasing the Kongs and attempting to bash them into pits.

In the SNES version of Donkey Kong Country 3, when Koin is defeated, the DK Coin is not collected instantly; rather, the DK Coin appears in Koin's spot, and the Kongs have to collect it manually. This was changed in Donkey Kong Land III, where the DK Coin would be collected the instant that Koin is defeated. This change, strangely enough, also made it into the GBA version of Donkey Kong Country 3.

In Donkey Kong Land III, Koin does not appear in any Coral levels, due to the lack of any separate cave sections at the end. Instead, the DK Coin is hidden in these levels, and the Kongs must find them, which is more reminiscent to Donkey Kong Country 2 and Donkey Kong Land 2.

Trivia

 * Their name is a pun on the word "coin" and "Kremling".