I feel like this individual requires a nickname. Some will know of/remember the story of a certain derby contestant who was caught putting lead weights in the belly of a steelhead. I won't name him as I bump into him (and his dog) somewhat often during steelhead season. We like to fish a lot of the same bushwack water. I find him quite pleasant, and we have shared a few tips/tricks here and there. Obviously, he made a mistake, and seems he owns it by doing his own thing and staying out of the derbies. Anyway, he didn't get off scot-free, and earned himself the nickname "lead belly."
For mr.switcahroo here, who has committed probably T-H-E most unsportsmanlike act of any fisherman who has ever fished, I would like to propose "switch."
Or, "tripple-play." Someone else caught the fish, on a different day, on a different river.
Lastly, "the fox." Looks cute and innocent, but is actually a sneaky little prick.
Sorry I've been into the pot