One of the mysteries of the English language finally explained.
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.
Mid 19th century; earliest use found in David Storer (1804–1891). From pickerel + frog [adjective], so called on account of its appearance.
pickerel frog/ˈpɪk(ə)rəl frɒɡ//ˈpɪk(ə)r(ə)l frɒɡ/
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