you can still grow it in the ground in areas that suffer frost. Here in 8b/9a Houston, we may have frost down to 20 degrees every decade that will kill just about any tropical fruit tree. In other years, the freeze is just borderline but ambarella will still be damaged at 35 F.
HOWEVER, dwarf ambarella, if killed to the ground, will re-emerge around May, and begin flowering, and fruiting in no time.
I suggest a mulch to keep the roots alive when cold weather arrives.
You can also grow it from seed and it will fruit the first year.
So that’s another group of tropicals that can be grown in cold weather, those that flower and fruit within a year. A few off the top of my head would be Papaya (grown from seed early in the season will fruit in 9 months), and some guavas will also fruit the first year from seed.
There are other methods to grow tropicals in frosty areas, but I will save that for a later post.