Real Dictionary

leapfrog
uncountable noun: Leapfrog is a game which children play, in which a child bends over, while others jump over their back.

leapfrog in American English
a game in which each player in turn jumps, with legs spread wide, over the bent back of each of the other players
to jump in or as if in leapfrog; skip (over)
to jump or skip over, as in leapfrog
intransitive verb: to move or advance in or as if in leapfrog
noun: a game in which players take turns in leaping over another player bent over from the waist
transitive verb: to jump over (a person or thing) in or as if in leapfrog

leapfrog in British English
noun: a children's game in which each player in turn leaps over the others' bent backs, leaning on them with the hands and spreading the legs wide
verb: to play leapfrog