Eeww.. Creepy. For the sake of science, I'd be interested in pics.
In the meantime, how about when you are doing your daily hoof cleaning, you add a scrub with lysol diluted in water. Make the mix stronger than you would use for the floor though. Wash all four, do something else, then go back and rinse. If nothing else I would think it would kill the eggs?
What if you sprayed the bottom of the hooves with something to make it slippery -- like Pam. I'm just not sure if that would cause any problems on the frog. If the eggs can't stick... Anyone have any input on that?