Ok.... so now there ARE frogs in Asia again. Phew.
Now, bear with me here. If there are indeed frogs, as you have now assured us that there are, and there are burmese pythons, and both of them are living in the same part of Asia, would not then the cohabitation of them not only be possible, but in fact, already occurring? And if in fact it is already occurring, does this not prove that it can indeed, should one wish to, be duplicated in captivity?
You have ASSumed that frogs of an innappropriate environmental compatibility would be purchased from "pet stores."
Just because that is what you would do, does not mean the OP would. Maybe he knows a breeder. Maybe he knows an importer. Maybe he'd go to shows until he found just what he needed.
Do you see where I'm going with you and your "facts" that are about as factual as your love for me is undying?