I guess they used Teen Titans Go! Beast Boy since he’s currently the best known, thanks to last year’s movie, and Cartoon Network showing it almost constantly. There are other versions they could have used. Comic Beast Boy, original Teen Titans cartoon Beast Boy, Young Justice cartoon Beast Boy. (Though not the live action Titans Beast Boy. The only thing green about him is his hair.)
I guess they used Teen Titans Go! Beast Boy since he’s currently the best known, thanks to last year’s movie, and Cartoon Network showing it almost constantly. There are other versions they could have used. Comic Beast Boy, original Teen Titans cartoon Beast Boy, Young Justice cartoon Beast Boy. (Though not the live action Titans Beast Boy. The only thing green about him is his hair.)