frog catching.......impossible?

I have a hognose that we feed frogs to (won't eat anything else). My 2 kids ages 6 and 8 are frog-catching experts. They just walk the yard with their LED flashlights (my yard backs up to a pond), and when they see one, they run to it, step on it lightly with their shoe, then pick it up. The frogs are not the fastest guys on the planet. They don't normally catch the leapers though - those that go on trees and can leap very far - although they have caught a few of them before just to take a closer look at their toes when the frogs stick to the window. Those they just quickly put their entire hand on it to prevent it from leaping off.