Devil’s urn (also called witches cauldron, and I once saw it releasing its spores and it did look like a simmering witch’s cauldron)
https://www.inaturalist.org/observations/8966858
Dead man’s fingers
https://www.inaturalist.org/observations/138279882
Witch’s butter. Warlock’s butter, black witch’s butter, white witch’s butter, witch’s hat, black witch moth
Satan’s bolete and the genus Satan which no one has observed
Ghost pipes, ghost boletes, ghost spiders, ghost crabs, ghost bats
Skull caps, skull spiders
Deathcap, death’s head moth
all of the members who have undead in their names
And Dragonflies were use to be known as Devil’s Darning Needles and it was believed that if you spoke lies they would sew your lips shut.