as people have already pointed out, this can't really exist because it's an oxymoron, although there are some bands that have been labelled as pop punk.
a real pop punk band is the Buzzcocks.
all the other modern day bands like good charlotte and sum41 and avril lavigne are shite. get over it.
girl1: i'm so cool cos i listen to pop punk bands like GC
girl2: ever heard of the buzzcocks?
girl2: (slaps girl1)