Frogs can randomly visit your garden and they might even stay for longer than you would expect. If that time comes, it would be troublesome especially since frogs come with their croaking sound. A few instances would be fine but having to experience that constantly can cause you quite the headache. If the frogs made it through your garden, you can test out ways to get them out of it.
Having frogs in a fish pond isn’t something to be surprised about. If the frogs start taking up too much space then that might be a problem. Before that could happen, you can remove the frogs which are present in your fish pond rather than wait for them to grow in population.