The eastern dwarf tree frog is one of the smallest green tree frogs, at just 3.2 cm, its back is green to fawn, sometimes scattered with dark spots. A dark bronze line runs from the nostril to eye. The groin and hidden part of the thigh are bright orange.

The eastern dwarf treefrog has a call that attracts attention, and a throat that does likewise. Using its bright orange vocal sac, the frog produces a two-part call: a long "wreeeek' followed by a sharp 'kik kik, kik kik'.

Males call during spring and summer with breeding occuring around water with lots of vegetation. Females lay between 2-35 eggs on vegetation and the male quickly fertilizes them. Tadpoles are dark with pale or patterned bodies.