The Australian, grunge-obsessed rapscallions who scuffled through a bratty Frogstomp debut have two albums later matured into a disciplined rock cadre. AC/DCish chords vie with plush strings on these adult arrangements, while frontman Daniel Johns pounds his pulpit in new politically inspired bursts. ''We are the youth/We'll take your fascism away,'' Johns snarls, sounding furious, motivated, and all grown up. B

