The Chaco horned frog or lesser Chini frog (Chacophrys pierottii) is a species of frog in the Leptodactylidae family. It is monotypic within the genus Chacophrys. It is found in Argentina, Bolivia, and Paraguay. Its natural habitats are subtropical or tropical dry forests, subtropical or tropical dry shrubland, and intermittent freshwater marshes. It is threatened by habitat loss.