The Mexican narrow-mouthed toad (Hypopachus variolosus) is a species of sheep frog native to the Pacific and Caribbean lowlands from southern Texas to Costa Rica. Sheep frogs make a distinctive call that resembles a sheep's bleat during and after rainfall in warm months. This species occurs in variety of habitats: tropical humid forests, open disturbed habitats, and various humid sites in more arid areas. There are no major threats to this widespread species.