I'm not sure on the history of why there's a Growler display team, but they regularly perform at air shows, even air shows where the Blue Angels or Thunderbirds are also performing. Their display isn't formation aerobatics, more a sort of fancy fly-by.

Air force, Navy and Marines have many display teams in addition to the two everyone knows. E.g. there's an F-35 display team and an F-22 display team. Usually they fly single though.