What are pinkies? - are they a hook bait?

The pinkie is the larvae of the Greenbottle.

Smaller than the maggot they can be used as loose feed in conjunction with maggot as the main hook bait or are excellent as a hook bait in their own right. Because they are smaller you can use them on smaller hook sizes for the shy biting fish.

They make an excellent addition to groundbait balls for loose feed carpetting. They are always worth taking along on any fishing trip