I found some paper.
I had the idea that this species of poo creatures are assigned a stone weapon of some kind based on their rank that they always carry within their bodies.
The lower ranked of the groups (like the poo girl here) get simple stone weapons, such as stone spheres.
The higher ranked of the groups (such as that Giant Shit Monster) have much more elaborate weapons, like the giant stone gear.
Though the poo girl (who I've decided to name Syrup) has such a simple weapon, she absolutely loves it to bits.