Osteopilus

Osteopilus is a group of frogs in the family Hylidae. These frogs have a bony bumps on their skulls. This makes their heads like helmets. These helmet-skulls are called casques. The name "osteopilus" comes from the Greek words "osteo-" for "bone" and "" () for "felt cap." Together, "Osteopilus" means "bone cap." 
These frogs can be brown, brown-gray, or olive green in color with darker markings or patterns. The disks on their toes. They do not have much webbing on their front feet. The eyes and eardrum are large. 
These frogs live in the Greater Antilles and the Bahamas, but human beings have brought "O. septentrionalis" to the Lesser Antilles, Hawaii, and Florida.
Species.
There are eight species in this genus: