Paddock-stool

The toad was popularly thought to impersonate the devil; and the toad-stool, pixie stool, or paddock stool was believed to spring from the devil's droppings.

Source: wiktionary

I asked an old woman in the fields this morning, pointing to a cluster of what we in the north-east corner call paddock-stools, and sometimes fairy-stools.

Source: wiktionary

Sometimes, when Jack happened to be in a humorous frame, he would seat himself at the bottom of the sea on one of the brain-corals, as if he were seated on a large paddock-stool, and then make faces at me, in order, if possible, to make me laugh under water.

Source: wiktionary