lorax

If I grew in pots, I'd be seconding the Babaco. Followed closely by the Mito (highland papaya) and Giant Granadilla (Passiflora quadrangulis) Finally, Ecuadoran white pineapples.

What are you considering a "tropical" fruit? I ask, because most likely you're already growing Nanners outside. Certainly in Texas you can get away with growing a lot more outdoors than in other parts of the States.