Hello and welcome to FF Becsnel! There are around 115 species of frogs in your country and you will probably need either a specialized book (i.e. A Complete Guide to the Frogs of Southern Africa) or someone who has knowledge of local species to ID the tadpoles. The good news is that you do not need to ID in order to raise and once they morph into frogs it will be easier to ID.

If releasing in the wild, a local pond is better than a flowing river. Many tadpoles can't handle swift currents and will quickly become prey or drown. Depending on their size; you could raise them all in like a 10 gallon tank or larger. Take them and their water into the tank and do 25% daily water changes with same temperature dechlorinated water. Can feed them fish flake food high in vegetable content (spirulina, etc.).

Once their legs are formed, will need to provide a slanted slate like rock or similar platform for them to be able to leave water. Same effect can be achieved by lowering water level and slanting the tank a bit in larger tanks like a 20L. That is important because otherwise the froglets could drown.

Depending on their size they will begin taking either wingless fruit flies or small pinhead gut loaded crickets once their tail is fully reabsorbed into their bodies. Dust all food 2X with CA/D3 and 1X with vitamins supplements weekly on different days and with skip day in between.

Once you get them well started can release and even keep a couple for pets (if lawful to do so). Good luck and keep the thread updated with their pics. We will try to help if needed. Good luck !