Etymology
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Words related to frog

bullfrog (n.)
also bull-frog, large North American species of frog, 1738, from bull (n.1) + frog (n.1). So called for its loud voice.
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froggy (n.)
1822 as a familiar name for a frog, from frog (n.1) + -y (3). As a disparaging term for a Frenchman by 1857.
froggy (adj.)
1610s, "full of frogs," from frog (n.1) + -y (2). Meaning "frog-like" is from 1837. Related: Frogginess.
frogman (n.)
"scuba diver in rubber suit," 1945, from frog (n.1) + man (n.).
frog-march (n.)
also frog's march, 1871, a term that originated among London police and referred to their method of moving "a drunken or refractory prisoner" by carrying him face-down between four people, each holding a limb; the connection with frog (n.1) perhaps being the notion of going along belly-down. By the 1930s, the verb was used in reference to the much more efficient (but less frog-like) method of getting someone in an arm-behind-the-back hold and hustling him or her along. As a verb by 1884.
frolic (v.)
"make merry, have fun, romp playfully," 1580s, from frolic (adj.) "joyous, merry, full of mirth" (1530s), from Middle Dutch vrolyc "happy," a compound of vro- "merry, glad" + lyc "like" (see like (adj.)). The first part of the compound is cognate with Old Norse frar "swift," Middle English frow "hasty," from PIE *preu- "to hop" (see frog (n.1)), giving the whole an etymological sense akin to "jumping for joy." Similar formation in German fröhlich "happy." Related: Frolicked; frolicking. As a noun from 1610s.
Rana 

frog genus, Modern Latin, from Latin rana "frog," which probably is imitative of croaking (compare frog (n.1)).

rennet (n.2)

variety of apple, mid-15c., renette, from Old French rainette, diminutive of raine, reine "frog," from Latin rana "frog," which probably is imitative of croaking (compare frog (n.1)). If so, so called for its speckled skin like a frog's. The other possibility is that the Old French name of the apple is literally "little queen," a diminutive of reine "queen," from Latin regina (see Regina). OED, which leans toward this suggestion, suggests the other is folk etymology.

tree-frog (n.)
1738, from tree (n.) + frog (n.1).