"Jumping Frog" or "Frog Leap" originates from English sex guides. It's similar to "Leapfrog" (the collapsed doggy style) but different: Leapfrog involves the woman's breasts against the bed with her buttocks raised high. Frog Leap, on the other hand, is a squatting position, like a frog crouching low in preparation for a leap, hence the name "jumping frog" or "frog jump." In some places, it's simply called "Froggy..."