From the Super Mario Wiki
Coin Coffers are enemies that first debut in Super Mario 3D Land. They have small eyes on top of their head, are round, have a light green color, and slightly resembles a frog's head, as well as a purse. Their name is a pun on "coin cougher", with "coffer" being another name for a container used for storing money or valuables.
Super Mario 3D Land
Coin Coffers react similar to the Moneybags as they attempt to run away from the player. In Super Mario 3D Land, they contain ten coins. Hitting a Coin Coffer in any way causes it to drop a coin, dazing it, and after five hits, it spits out the rest of the coins it contains before it is defeated. Ground Pounding one causes it to spit out all of its coins before being defeated. When hit by Mario under the effects of a Star, its ten coins are dropped in a ring shape. Coin Coffers first appear in World 2-3, though one can be found hidden in a rock in World 2-1. Some Coin Coffers are hidden under rocks and grass.
New Super Mario Bros. 2
They also appear in New Super Mario Bros. 2 similar to how they did in Super Mario 3D Land. They appear sometimes after activating a Red Coin Ring too, dropping eight Red Coins as it bounces. If Mario defeats it before it can release all the Red Coins, they will all be dropped. They only appear in World Star-1 and World Star-7, as well as several DLC courses.
Super Mario 3D World
Coin Coffers also appear in Super Mario 3D World. They act the same as how they do in Super Mario 3D Land. However, they are now invisible and hide in certain hidden areas of levels. They can be made slightly visible by touching them on the GamePad, and jumping on them will fully reveal them.
Puzzle & Dragons: Super Mario Bros. Edition
Coin Coffers appear as enemies and potential allies in Puzzle & Dragons: Super Mario Bros. Edition. They come in green, red, blue, yellow, and purple colors, which represent which attribute they have; fire for red, water for blue, wood for green, light for yellow, and dark for purple. Unlike most enemies, the player has to have multiple party members attack the Coin Coffer at the same time to defeat it. Also, it might run away from a battle.
All Coin Coffers have a skill that doubles the amount of coins won during a single battle. Also, they're unique in that level 1 is their maximum level. Coin Coffer allies can give party members a good amount of experience points whenever they're used to power them up, which can be handy for leveling up lower-leveled characters.
The player can also transform the Coin Coffers into King Coin Coffers, which have a maximum level of 1 themselves.
Names in Other Languages