Plague of Frogs is a mythos card. It first appeared in the Dunwich Horror expansion.
Mythos Type: Environment (Weather)
Gate Opens: Gardner's Place
Clue Appears At: *Cold Spring Glen
Mythos Ability: Lore checks in Arkham are made at a -1 penalty. Will checks in Arkham are made at a +1 bonus. Witches and Warlocks move like stalkers.