Board Thread:General Discussion/@comment-38368624-20190213124526/@comment-1038387-20190213150554

Beast Boy, Star Girl, Raven and Cyborg didn't become members of the Teen Titans until about 20 years in. While The New Teen Titans was the best selling (and one of the best) comics DC ever put out and it was used as an inspiration for the animated series, doesn't mean it was the only composition of the group. The comics team also had Kid Flash and Wonder Girl, which the animated series mostly ignored. YJ used the same three founding members, something TT did not: Robin, Kid Flash and (sort of) Aqualad.

The Team is the Teen Titans, the New Teen Titans, the Titans, the New Titans, etc. It's all young hero teams in an adaptation of the DC Universe as a whole. Having the name in-universe made little sense, and having the name as a title for the show was problematic as there had just been one with that name. But this show could just as easily have been called Teen Titans'.