NOT heavy metal but yes punk-rock, they are counted as rock sometimes. but yeah, mostly punk, they were made to be punk but when the guys started they were counted a rock, and always there is no where that they r pop.... hardcore punk
well I dont about heavy metal but my fave rock band is 'Forever the sickest kids' they are rock, trust me. All my other bands are punk and エモ like Greenday and MCR. so yeah FTSK