Hi Nik, welcome to the forum.

Once they develop legs they can come out of the water aquarium. Provide them with a very shallow water bowl only filled on the very bottom (only enough to sit their butts in), with dechlorinated tap water or spring water. They will eat the lettuce until just about time to absorb their tails. They often stop eating a day or two while absorbing their tail. Once they pass this phase they can then start eating tiny fruit flies and springtails. You will need to very lightly dust their flies with calcium/vita D3 two days a week and amphibian multivitamin one day a week.

I have found that it is easiest to monitor small frogs or toads using paper towel substrate. A fine mist of treated water helps keep them moist. Most toads will prefer only a damp floor with a water bowl if they want to soak.

After the tads leave the water their lungs open and fill with air. They now have to learn to hold their breath underwater, so many drown. I remove my toadlets when all 4 legs have developed.

If feeding fruit flies, you may want to cover your screen lid with a nylon or fine netting so the flies do not escape through the screen holes.