More than two people are enough, and there is no upper limit.
Everyone shouts "1, 2, 3, 4" at the same time (this step can be omitted), and then shouts "Frogs jump, frogs bark, and a frog jumps into the water" at the same time. Then, from left to right, everyone shouted a word, which read: a frog jumped into the water, quack; Two frogs jumped into the water, quack, quack; Three frogs jumped into the water, quack, quack, quack and so on. Several frogs quacked a few times. It should be noted that when there are more than ten frogs, the caller should shout out integers, such as eleven for eleven.
For example: * * * Six people, ABCDEF, took part in the frog jump, shouting "1, 2, 3, 4" at the same time (this step can be omitted), shouting "Frog jumps, frog barks, a frog jumps into the water", and shouting to squat and then stand. Then from right to left, A shouted "One", B shouted "Only", C shouted "Green", D shouted "Frog", E shouted "Jump", F shouted "Down", A shouted "Water", B shouted "Gung" and then squatted and stood, C shouted "Two" and D shouted "Only".