I haven't looked (literally the only thing I use them for is making smoothies when our Cavendish plants aren't producing) but I believe the "Thai" ones (or similar) are available in other SE Asian countries too, so it's possible they're very similar/the same thing.
They look very similar (very much like 3rd from the left in https://upload.wikimedia.org/wikipedia/commons/d/de/Bananava...) when peeled (apart from size - they're generally 1/2 or 1/3 the length of an average Cavendish and a little fatter, relative to length) but they're much 'juicier' and probably a little sweeter too.
The taste itself isn't enough to put me off (see above about smoothies) but the texture is unbearable, it's like an over-ripe Cavendish.
Edit: for some growing-bananas-in-thailand trivia:
Here at least, the little horrible ones grow a lot faster and are much more durable than Cavendish. The tallest Cavendish plant we've had so far is maybe 2.5m tall - I can always grab the bunch when cutting them, and generally I can carry the bunch one handed.
The "Thai" ones are giant plants by comparison - usually 4-5M when they produce, and the biggest bunches I can't carry at all.
Then you have the giant Thai ones (the name translates as "Elephant banana") - the plant is as big as the regular Thai ones, but slower to produce fruit. The fruit itself are like a Cavendish on steroids - easily 2x the size, but horrible to eat, not even any good for smoothies. Even my in-laws don't know anyone who actually eats these ones.
Then there's the even tinier Thai ones (the name translates as "Egg banana") which have a quite short, but very leafy plant (maybe 2-2.5M tall at most) with lots of offshoots. The fruit itself are tiny - most plants here the bunch never drops down to 'hang' because it's not heavy enough, and the bananas are, as the name suggests, comparable in size to a large chicken or duck egg, and almost egg shaped too.
