"a frog, a toad," c.1300, dim. of pad "toad," from O.N. padda; common Gmc. (cf. Swed. padda, Dan. padde, O.Fris., M.Du. padde "frog, toad," also Du. schildpad "tortoise"), of unknown origin and with no certain cognates outside Gmc.
"an enclosure," 1622, alteration of M.E. parrock, from O.E. pearroc "enclosed space, fence" (see park). Or possibly from M.L. parricus (8c.), which is ult. from Gmc.