A toad can consume alot of insects in the wild. Avoid mice as told above. Mice I would personally only feed to some animals that CAN eat them and only as a treat or to get them fattened up a bit(Say if they lost a bit of weight because you may have forgotten a feeding or two).

What I would do is if the toad is 1inch, feed 3pin head crickets every other day. If its 2inches. Feed 5pinheads every 2days(dust every other feeding for both sizes), at 3inches and above you can feed 12large crickets every feeding which for me is every 2 or 3 days. Sometimes I even feed like 30crickets per toad a week. You could also get them onto worms later down the line so to alternate from earthworms and crickets. Inspite of what a lot may say. I find earthworms to be meatier, and healthier. You don't have to gutload earthworms as you do with crickets.

Try a varied diet. That's pretty much all I can say, because feeding depends on MANY MANY things for examples:
1)Type of item you are going to feed. Crickets are less meatier than an earthworm. So one earthworm(nightcrawler--large ones)= 5-6large crickets. Or one dubia roach(large adult)=3-4adult large crickets. That's just my opinion.

Toads like to gorge themselves and in reality there's no much in overfeeding if you're actually feeding them crikets, worms and stuff like that. When they stop feeding it means they're extremely full*but that's my opinion*.

I personally think you can feed up to 3-4doz. crickets(large) to an adult toad(female)a WEEK. It's not a need. But it's like you could and it won't really damage them. Just divi. up the numbers so not all in the same day. You know?
Gutload them with veggies and such and then dust one feeding when they're fully grown.