Coconut Milk Vendor is a character who owns a food stand on Main Street, next to the Coconut Cafe. If you talk to him, he will give you a free glass of Carbonated Coconut Milk. The coconut milk is necessary when completing Shark Tooth Island as it is one of the three items you need in order to make the recipe.
The Coconut Milk Vendor has tan skin, stubble brown hair, and is shirtless except for a pink flower necklace and green pants. He looks very cheery.
When you have all the ingredients for the recipe, including the Carbonated Coconut Milk that you get from him, you can bring it to the Medicine Man, who makes a potion to put the Great Booga Shark to sleep.