pickerel frog
/ˈpɪk(ə)rəl frɒɡ/ /ˈpɪk(ə)r(ə)l frɒɡ/noun
A common North American frog, Rana palustris, which has a double row of dark squarish spots down the back and bright yellow or orange coloration under the hind legs.
Origin
Mid 19th century; earliest use found in David Storer (1804–1891). From pickerel + frog adjective, so called on account of its appearance.