Hi guys

I've got 40 brown tree tadpoles that are in the process of changing to frogs.
I can really only keep about 8-10 frogs in the terrarium I have.

Long term I would like to breed them (although I know it will be several years before they reach sexual maturity).

My question is ..... if I picked the first 8-10 tadpoles that changed to frogs.....what are the chances I would have both sexes?
Would one sex develop faster than another or is it random chance...as I understand it is next to impossible to tell the sex of a frog at this young age.

Your thoughts & feedback would be appreciated.

Regards

Nigel