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Thank you to Samuel and Sakunthala who sent separate solutions to this problem. Samuel recorded his solution in a very clear way:
B x x x G
x B x x G
x B x G x
x x B G x
x G B x x
x G x B x
G x x B x
G x x x B
Samuel explains that they have both swapped places without getting wet. He says that at school they continued the problem up to 11 pads with 5 frogs of each colour. I wonder whether you noticed any patterns in the numbers of jumps it took each time, Samuel?
Sakunthala did it in exactly the same way but started with the green frog.