Answer:
You can prevent frogs from reproducing by introducing carnivorous insects (waterbeetles) are large fish. They will get rid of all the larva. The only way to lose the adults is either killing them or remove them and let them go at least a couple of miles away. If you release them in the neighbourhood they will return.
Killing toads & frogs is illegal in most countries, and since in general frogs are declining it is not a good idea.