This word seems to have escaped the lexicographers. Meaning obvious.
1799. The land adjoining and including Frog Pond, situated in said town of Newburyport.Mass. Mercury, Feb. 19.
1799. The hero who performed such wonders at the Kensington (Phila.) frog-pond.The Aurora, Phila., May 28.
1825. Winkin away, jess like so many milk adders, at a frog pond.John Neal, Brother Jonathan, i. 143.
1829. The centre [of the district] had been discovered exactly in the centre of a frog-pond.Sarah J. Hale, American Sketches, p. 121 (Boston).
1854. You know no more of its terrors than a man on a frog-pond in a rain-storm knows how the Atlantic looks in a hurricane.Yale Lit. Mag., xix. 363 (Aug.).
1859. After a man begins to attack the State-House, when he gets bitter about the Frog-Pond, you may be sure there is not much left of him.Holmes, The Professor at the Breakfast-Table, chap. xi.