Green Frogs (Lithobates clamitans) are very territorial, especially the males. You can differentiate their sexes since they are dimorphic (showing observable differences in form, color, size, or structure between sexes). For example, Northern Green Frog (Lithobates clamitans), Connecticut Northern Green Frog Lithobates clamitans, the Green Frog floridensis About Green Frog Maryland Biodiversity Project Green Frog Lithobates clamitans Maryland Biodiversity Project