Acorn

Acorns are items only found in Click Clock Wood in Autumn. Six acorns must be collected and given to Nabnut, where he will then eat them so that he does not starve during the Winter. If all six acorns are given to Nabnut, he will award you with a Jiggy.

Trivia

 * Even though Nabnut is seen eating a pile of acorns in the Summer, he only needs six of them to survive the Winter.