I'm surprised no one's mentioned the Mandalorians yet. And there are so many "warrior races" too. Wookies, Devarionians, Echani, Anzats, just to name a few. Even in canon, there's the Lasats and Aeosians.
Ewoks, maybe? Hume Tarl explained their methods in Star Wars Galaxies. Brutal. I mean I know they have names, but it's the group that's ever been shown doing anything. Mostly because all ewoks we see outside the movies (and the "Battle for Endor/Caravan of Courage"😉 are children, but still.
The Abominor and Selentium, from Star Wars Droids: The Great Heep and Tthe Lando Calrissian Adventures respectively? They're supposed to be the races that drove the Yuuzhan Vong out of their original galaxy. Some Abominor were said to grow to the size of planets.
The Clone Troopers were actually great fighters, too. They were clones of THE Jango Fett, after all.
In Canon, and this is obscure, but in Vader Immortal, the descendent of Lord and Lady Corvax were granted the robot army. He/She never ended up using it all that much, but it might qualify?