If you're prepared to do daily 100% water changes in your 10 gallon tank for the next year to keep it from stunting, you can try.....If not, I'd advise you don't attempt to put the paradise in a 10 gallon. It will prefer a tank that is long horizontally as opposed vertically.

I wonder how many of those people have kept it for a good 2-3 years in those 10 gallons with it growing to its maximum potential.

Paradise fish are predatory by nature and an adult will surely look at your dwarf frog and get curious and start picking at it.