How to tell which frog egg is fertile?

[Murray of the Deep]

how to tell if frog eggs are fertile or not?

[KiwiSugar]

dont knw if diff eggs are the same, but would say, bad eggs swell, either white or dark centre only more fuller, doesnt take long to tell good ones from unfurtile ones

[Hoppity100]

Do you have a microscope handy? That could help, I read they are clear ball looking sacs, I think with a black center? I'll be looking for some because I must have a male and female. The male chirps every night and I have seen them playing leapfrog before. I thought they were excited seeing me coming with dinner! They sometimes sit on their driftwood and wait, then I see one clapping when I approach LOL. Really, one of them sits and waits. Gosh, you'd think I was serving them a turkey dinner with all the fixins. If they could eat people food I'd make them a new entree every night. Wish I could tell difference between frog sexes.