I ordered 3 pyxies and ended up with one male. I already had a female when I ordered the trio. The only likely reason that I got a male is because I spoke with Bruno at LLL reptile and he hand picked them based on my description of what a male would likely look like at a young age....he picked one male.

Get 5, and you'll end up with a male. Or, get eyes on the frogs you want and pick individuals by comparing them. When you get a group of them together, you can tell the males that will become the "big males". They are pretty obvious from a young age.