A mushroom or toadstool, especially one supposedly associated with frogs or found in damp, frog-inhabited areas; an archaic or poetic term.
Compound of 'frog' + 'stool' (archaic term for mushroom/toadstool). This term reflects medieval and early modern connections between frogs, toads, and fungi—creatures all associated with dampness, darkness, and the magical/poisonous.
Medieval people thought frogs and toadstools were mysteriously connected because both appeared suddenly in wet places—and they weren't entirely wrong, since frogs need damp environments and fungal spores absolutely thrive in moisture.
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