If you are trying to encourage frogs to breed in your small backyard pond, it is best not to stock your pond with fish, with the exception of the perhaps a small number of mosquito fish.
It seems many species of fish will eat tadpoles. In addition, young fish will often compete with tadpoles for food.
Very interesting. We had the goldfish first and then the local frogs discovered our backyard pond. Now we have tadpoles and just saw one today that is surviving. We know we had more but they do seem to hide. We’ll soon see if we have more than 1 frog. We also discovered some of the goldfish had babies too. It will be interesting to see how this goes.