going to be kermit the frog for halloween: beyond a little hat and some green and brown clothes, is there anything i really need to put the look together?

Absolutely a banjo.

you need the little neck thing

Maybe along with a green spiky collar some makeup around the eyes to mimic his line-and-dot pupils?

A Ms Piggy to go with you

The tie.

The neck thing. And if you can, a hand up your shirt

banjo