The closest Acorn Shell that can spawn is there

Pond Outpost Chest has Spaghetflea and 2 Granola Bars

Black Ant Lab Chests have 2 Omelants, 4 Feathers and 3 Gum Nuggets

Black Ox Beetles drop enough parts to make a hammer from 2 kills

2 of the 3 Termite Soldiers at the start of the Woodpile drop 2 Termite Chompers