I have had good experience raising tadpoles of all sorts. I kept them in a 10 gal aquarium full of water, and would feed them bundles of spinach (rubber-banded and weighed down). They love it, and it's easier for them to eat if it's stationary. When the little guys start showing body parts, it's time to make a platform for them to hold themselves out of the water. In my case, I used a plastic plant pot and submerged it upside down in the aquarium with a thin piece of wood (5" x 10" x 1") on top. You can keep the board from floating away by putting a river rock on top of it over the pot. Bring the water level a little over the wood. That makes it easy for them to get on it when they're ready. If they can't get themselves out of the water somehow, they'll drown.
When their tail is just about gone, you can start lowering the water level to just at the edge of the wood board. This will allow them to still be able to get on it, but also enable you to put bugs on the wood for them to eat. Start out with ants. Ants are easy to collect with a small plastic cup and a 1" paint brush to sweep them into it. Want to make it really easy? Place a Jolly-Rancher candy in the sun on some concrete around a desirable place of the house and wait a couple days. The ants will find it and you'll be able to sweep them into the cup on the concrete instead of the dirt.![]()