What do meat processors do?
A meat processor prepares meat for packaging. As a meat processor, your duties revolve around cleaning, grinding, and packaging meat. You are also responsible for sorting meat and labeling packages. To perform this job, you do not need formal education, but you must complete on-the-job training.

Se for quem desossa é um "deboner". Se for quem faz os cortes posteriores à desossa, creio que é "butcher", mesmo, a confirmar com os colegas.

"In broadest terms, a slaughterhouse kills live animals and turns them into carcasses. They will often also do preliminary cleaning and butchering - remove head, feet, skin and internal organs. Sometimes they’ll break the animal down into primals as well.

A butcher takes in animals that have already been slaughtered and do further processing - either breaking down whole carcasses into primals, break primals into subcuts (your steaks, chops … etc) or do things like make sausage or other processing work."

É o que parece.