Amphibians are represented by one species of triton, marsh frog, common frog and green frog. Among amphibians common are lake frog and green frog. Apart from the green frog, the decoration was in a monochrome sepia. Slippy's design is that of an anthropomorphic green frog (despite his name). Most were republished by Random House and Green Frog as regular hardcover and softcover books. The two subspecies are the bronze frog and the northern green frog. Also at Catherine's request, each piece carries a green frog. Green frog tadpoles are olive green and iridescent creamy-white below. It was formerly placed in "Rana", and included in the common green frog ("H. erythraea"). Commonly seen amphibians include the green frog, leopard frog, carpenter frog, and the Fowler's toad. The emerald green frog, like most other frogs, are oviparous and polygynandrous. The northern green frog dwells in marshes, swamps, ponds, lakes, springs, and other aquatic environments.