The Pandaren fighting arts are the most prominent and probably the most developed hand to hand fighting forms - the Fierce Tiger, Sturdy Ox, Wise Serpent (and Spirited Crane) stances are all specialized forms of combat with differing strengths.
It’s true that whilst these styles haven’t been in the hands of other races for long, but Zen at least has been aware that these styles have been developed by pandaren, and mostly for pandaren. There are things about the styles that might not necessarily change drastically for the other races - but for example, long-limbed races like the elves, or trolls, might want to use more kicks because of their advantage in reach. Draenei and tauren would probably want to make use of their punches, and may have to adjust how they kick due to having hooves in place of horns.
In time, the other races will make these styles their own by implementing minor differences this way. But as for the combat forms themselves, they’ve been honed for 10,000 years under the watchful eye of Celestials. There’s really not much more that can be done to “improve” them in that sense.
If we make the comparison to Capoeira - which I get is the troll dance… though I personally don’t find it makes too much sense to work as a fighting style. Capoeira was developed by slaves who disguised their fighting as a dance. I don’t think trolls have ever been placed under mass suppression like that. Coincientally this is how pandaren monks came about anyway - being slaves meant they had no weapons.
That said, I remember from the last Celestial Fist Tournament we had a Darkspear troll RPer I believe who was a “Jaguar Warrior.” I believe the concept was like being a warrior who embodies an animal spirit - in this case, a feral cat that bashes things with its paws (or fists / claws in this case) and athletically leaps about.
Something like that is thematically could work. I’m not sure if it’s grounded in any established lore, but it worked well enough.
The draenei have Jed’hin as well, though I believe that’s more like a traditional wrestling sport or competition fighting style where there are many rules - and winning within the confines of those rules is the idea. In an actual fight though, it’s the things that make you good in Jed’hin such as being strong, sturdy and agile that are probably more helpful than actually knowing Jed’hin techniques.