This is a Q i have never found out, but i did!! Frogs sit on the lily pad because they dont sink under the weight of a frog. Also, flies and other insects find the lily flower very attractive, so they get bed and breakfeast! Also, what else would they sit on! A crisp packet?!
Yes, the frogs sit on the lili pads waiting for bugs. Also they can swim in the water if they want to but they dont live there. mostly frogs are on lily pad or on the land waiting for bugs coming their way!