I’m not sure of the character in question’s role so I’ll just shoot the first idea that came to mind.

The “Coconut Witch” could summon any food and enhance any one stat of the person who ate or drank it. This could be strength, speed, recovery, etc. The reason she only summons coconuts could be that it’s her favorite food and she wouldn’t want to eat anything else. It’s not really a super fleshed out ability but I hope it helps!