Feeding Firebelly Toads...?

I've recently purchased a pair of firebelly toads, and it occured to me that I'd researched what to feed them and when....but not how many... I've been all over the internet trying to find out how many crickets to feed them in a week. All the websites say a dozen to two dozen all at once. I dumped a dozen crickets in there before heading to work....and when I came back they're ALL gone...and I have two extremely fat toads who are now waddling about their home searching for MORE...I don't want to overfeed them...so if I ration the crickets out...how many should I feed them per week? Or per day?? o_O