carefully remove them and take them to a near shady place or a pet store if you want them to be someones pet
get a insecticide and drink it, so that you will not see those toads anymore.
You can't and I don't see why you want to. Frog spawn in your pond is just nature, it's like having birds in your trees and plants in our garden. :)
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...
If I were you I would just co exist with them. They will devour many pesky mosquitoes and other flying pest!