There are no green crabs in Puget Sound, only in Willapa Bay and Grays Harbor, and there is no sport season on them anyway. Juvenile Dungess Crab can look kind of green in certain areas, and that's probably what those folks are killing. And you better read those regs - the only species that can be retained are Dungeness and Red rock. Minimum size is 6.5" for Dungeness Crab and 5" for Red Rock Crab - and you can't keep Graceful Crabs unless they are 6.5" and they never get that big. Also, it is illegal to retain part of the crab (the claws) in the field without the whole crab it came with - otherwise how is anyone to know if those claws were off a legal size crab?

WDFW Enforcement will be glad to accept your contribution to shellfish management for harvesting those green/undersize/claws, though, so knock yourself out