A: Yes, Worf can count as Klingons for the purposes of Goals, though he should not be treated as a Creeper. The same goes for Kor from the Porthos Pack, and for B’Ellana Torres from Voyager (never mind that she’s only half-Klingon – Spock was only half-Vulcan, and he was constantly being treated as if he were all-Vulcan.)