The People of the Toadstools were followers of Jadis during the Long Winter and subsequent Winter Revolution. No physical description is ever given of them. In illustrations of the battle and Aslan's sacrifice, they are drawn as large toadstools that have roots that are used as limbs. In the Anime Adaptation of (The Lion, The Witch and the Wardrobe), They were humanoid toadstools that have the top of the toadstools like hats.
They were also present at the sacrifice of Aslan at the Stone Table.
The People of the Toadstools may have been related to the Nymphs of Poisonous Plants, which were also servants of the White Witch.