It's a really weird acorn that makes funny noises when you shake it. Maybe you can use it as a decoration for your tree.

Mermalair Computer : Battle For Bikini B… 💬 SpongeBob (FNF MCM "Road Rage") TTS Comp… Danny Nicktoons Unite Playable Character… Timmy Nicktoons Unite Playable Character… Mr. Krabs : Battle For Bikini Bottom Patrick Nicktoons Unite Non-Playable Cha… PlayStation 2 SpongeBob SquarePants Batt… Cosmo Nicktoons Unite Non-Playable Chara… Professor Calamitous Nicktoons Unite Bos… Evil Gene Brawl Stars Voicelines (Mobile… Sandy Nicktoons Unite Non-Playable Chara… PlayStation 2 SpongeBob SquarePants Ligh… Bubble Buddy : Battle For Bikini Bottom Flying Dutchman : Battle For Bikini Bott… Tlaloc Tak & the Power of Juju Voices (P…