That name reads like a fledgling edgelord cycling through "cool" usernames:

Well, obviously Dino (pron: "Deeno" cuz clever) Big Demon —no, gotta make it exotic, hmm. Oni! Those are so cool, yeah. That's the one. Beeeg bada-Oni. 🤣

edit: I was thinking of making an ork joke, too, re: T-Rexes being enormous chickens, but I think Kroot fit that mold better, and I know so little about them otherwise. 😅