Young coconut is called buko. Its flesh is soft, thin and silky — you can easily scrape it off with a spoon. In contrast, the flesh of a mature coconut is niyog, which is thick and hard and needs to be grated off the shell.
There is a favorite flavor combination in the Philippines called buko pandan, which is tender white coconut and fragrant screwpine leaves.
The word buko can also refer to a bud of a flower or the young fruit of a tree.
búko ng rosas
búko ng papaya
young papaya fruit
There are other meanings for the word buko. Check buking.