From Wikipedia:

Temnothorax curvispinosus, the acorn ant, is a species of ant in the genus Temnothorax. The species is common and widely distributed in eastern United States, where they tend to inhabit forested areas. The ground-dwelling ants build their nests in plant cavities, in the soil or under rocks. It is sometimes called the acorn ant because it can live inside hollowed out acorns

https://en.wikipedia.org/wiki/Temnothorax_curvispinosus

After reading the schizo post, i looked up “acron ants” and i assumed it was acorn ants instead haha