A Banana Coin.
Another Banana Coin.
Banana Coins are objects that appear in the AngieYaz/RoseOfSharon reboot of the Sonic Underground television series, emigrated from the Donkey Kong video game series. They are a type of currency used on Kong Island. They are golden coins with a banana on them. These can be used to buy things. They are a sub-currency of Mobiums, thanks to a trade agreement that was signed between King Sonic and King K. Rool.
They are coins depicting a Banana, or sometimes a Banana Bunch: these are known as Banana Bunch Coins.