No. There are no disposal services for decomposing carcasses found on Oregon beaches.
Most carcasses remain on site to decay naturally and provide food for scavenging birds, etc. We receive reports of hundreds of dead marine mammals each year, and while we value each report as an important data point, we only have the time and resources to collect and necropsy a portion of those animals that are freshly dead.
The Oregon Department of Parks and Recreation is the agency responsible for the maintenance of the ocean shore. If a carcass concerns you, try contracting them and request a ranger to bury it. On the central Oregon Coast, this number is 541-563-8500.