I beleive frog deseases don't die with the cold. Cytrid* for one, thrives in local ecology, even though it hasn't caused mass frog death, it is still present. If u could bleach, boil or bake it would be ok. Then u have problem of drying them out again, or them setting on fire in your oven. I've heard of microwaving, but I wouldn't know how long to set it to.