These green coconut mugs were sold as bundle packs with Mahiki brand coconut rum and separately as well. They were part of a campaign by MBG International Premium Brands (based in Germany) and capitalized on the Mahiki Clubs before they started to close, circa 2020 or so.

From Novado:

"The 'Coconut Edition' coconut mugs from Mahiki bring that summery Caribbean feeling straight to your home.

6 high-quality mugs come in a set, in which your favorite drinks can be served perfectly.

For example, the new MAHIKI White Coconut can be enjoyed from these mugs and also looks super authentic in the shapely coconut drinking containers.

Of course, these special cocktail and long drink mugs are dishwasher safe and easy to clean.

Possible filling quantity: 350ml."