I called the Department of Fish and Wildlife, not the cops. They forwarded the matter to the State Police, who deal with issues of enforcement.
FWIW, the people are probably not going to get in any real trouble. ODFW prefers to go after poachers and other criminals, not people who feed cute baby deer. There is little to be gained by prosecuting people for what they honestly believe is an act of kindness. What is typically done in cases like this is that the people are educated about the law, given a warning, and the deer is taken away to be released in the wild or otherwise humanely dealt with. The woman I talked about in an earlier post who was feeding the bears was given multiple warnings and small fines before actually being prosecuted in the aftermath of the incident where her neighbor had to shoot one of the bears.