Coin Coffers are enemies that debut in the game Super Mario 3D Land, they are green money-bag like creatures that resemble both purses and frogs that have eyes at the top of their head. Their name is a pun on "coffer," which is a name for a container used for storing money or valuables, and "cougher," referring to how coins come from their mouths. They also seem to have a similar behaviour to the Moneybag enemy.
Super Mario series
Super Mario 3D Land
Coin Coffers make their first appearance in the Nintendo 3DS game, Super Mario 3D Land where they are first encountered in World 2-3, though one can be found hidden in a rock in World 2-1. 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.
New Super Mario Bros. 2
Coin Coffers also appear in New Super Mario Bros. 2 with similar behaviour to their action 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.
Super Mario Odyssey
Coin Coffers return in Super Mario Odyssey where they can be found in the Sand Kingdom and Wooded Kingdom. They retain their invisible ability from Super Mario 3D World. When they are visible to the player, Mario is able to capture one using Cappy. When a Coin Coffer is captured, they act like Coin Boxes when running around or while standing still. The player can also choose to spit out Coins which act as projectiles, which also depletes their amount.