1 - another way is getting a clay saucer plate. Its what hold a flower pot. and put it in your substrate and even it out with it. and make sure none of the substrate is in there. If your using sand it doesn't matter, the frogs will eat sand and pass it through. So i have a clay saucer plate in my tank with sand.

2 - then i defrost my blood worms in a small plastic container with water for 15 min.

3 - i then take a baster and suck of the blood worms, and put them in the tank in the saucer.

4 - i then bring all the frogs to the saucer and show them where the food is (my frogs now no every 4th day they are eating at go to the saucer)

5 - time them no more than 15 minutes for eating or they "apparently over eat" but mine usually leave when they are full.

6 - then remove the food and you are done.

easier to clean cause the food is in one area, and some times the frogs argue over food its actually funny haha. but thats another way you can feed them.