Go rent a 3" gasoline semi-trash pump. Dewater the pond. Every day for a week, dewater the pond. Hopefully the majority of the frogs will leave for greener pastures. Dewater the pond one last time, and throw enough hydrated lime in the pond bottom to bring the pH up to 11. Let it naturally fill up with water over the winter and re-stock it with fish. That's the only way that I know to get rid of the goldfish for a homeowner. Now, depending on the state regulations, Rotenone is an option for a licensed applicator. That will get rid of the goldfish too.
Other than those 2 options, I'm at a loss. No fish that you put in there will eat only the goldfish.
Rotenone is illegal in Massachusetts. Not sure about the other states in the New England.
What state are you in Greyhound?
