The Gold Nugget is an item that you will find in Kaya Forest. You will use this to trade for another item in Nabooti Island.
How to get the Gold Nugget
On the Kaya Forests, go to the right of the plane once you land and then jump onto the roof of the second hut. Then jump up into the trees and you will find a gold nugget in one of the treetops. No one really knows how a gold nugget got into the treetops, but we’re not going to ask any questions.