Unlike other leagues, virtually every team is technically an expansion team. Only 2 modern teams were a part of the NFL’s inaugural 1920 season (which would make another good trivia question now that I think about it), so talking about expansion teams in general isn’t interesting.
But what about post-merger expansion teams? Of the NFL’s current 32 teams, 26 were around in the first post-merger season in 1970. But of those 6 who were born after 1970, which was the first to reach a Super Bowl?