It is endemic to eastern Brazil, with its distribution ranging from northern Espírito Santo to Bahia, Sergipe, Alagoas, Pernambuco.

[3] The specific name haddadi honors Célio F. B. Haddad [fr], a Brazilian ecologist and herpetologist.

The fingers and toes have rounded discs and are partially webbed.

Dorsal coloration is variable, but most individuals are dark brown with white snout and stripes running laterally to the inguinal region.

[2] Dendropsophus haddadi occurs in coastal rainforest and in scrubby coastal "restinga" vegetation, as well as in gardens, farmland, and towns, at elevations below 650 m (2,130 ft).