Your connection to the forest and your knowledge of its children let's you know exactly what is going on here.
These are mossmen in the final stage of their lives. Having taken root around the stones, their final task is to create the tubers from which the bush brats hatch, restarting the life cycle.
The __elf steps up to a thick portion of hedge, its own forefather, and digs around in the dirt beneath it with the handle of its spear. It stoops down, reaches in, and pulls up a thick hunk of spongy root, earth clinging to it. It holds the root out to you.