Brilliant approach. The mental picture of frog hopping to a control is lovely!
It was good seeing how big Katherine has gotten and she's very cute!
I wish I could claim some sort of toddler-whisperer inspiration, but really it was Katherine in tiny tyrant fashion saying "jump, mommy! Not like that- jump like a frog! No, not jumping anymore! March!" Then singing the ants marching song, except in her version, they just keep marching one by one indefinitely.