Actually what I meant to ask is how did their parents end up breeding this late in the year. Obviously the little guys can't breed yet!!! This gives me hope that I might be able to find some grey's before winter hits...
In reality the correct answer is you want roaches, fruit flies, and crickets, and moths, and anything else you can breed to give the most balanced diet possible. With that said If you are going to focus on one, I still vote for blatta lateralis roaches. Yes I know, ooh, creepy... I'm a bug person so it is easy for me to overlook this factor (in fact, I'm guilty of thinking they are kind of cute) but let me pitch them to you... If you have your own colony (which is super easy) you have roaches of all sizes, so you can feed babies and adults alike. They don't give off an odor like crickets do, and this species of roach (and this is important) is non-invasive and WON'T SURVIVE IN A NORTH AMERICAN HOUSE IF IT ESCAPES. Crickets on the other hand, get everywhere... Lateralis are tropical and need high humidity to survive, also they can't climb smooth surfaces or jump really, so they are easy to contain. Take the time to do some research on these amazing feeders, they are almost as much fun to cultivate as the frogs are! At any rate, if you are interested, I got my lateralis at Jamie's tarantulas, their customer service is top notch https://www.jamiestarantulas.com/Pro...oductCode=2010. You'll need a lot to feed that many frogs... If I haven't convinced you, and you want crickets, Go to Josh's frogs, I haven't dealt with them personally, but I've heard good things. Josh's Frogs Pinhead Crickets (500 Count) | Josh's Frogs. Good luck, and again, if you are willing to ship them I'd love to take a few of those little guys off your hands!