I spend a fair amount of time in Oklahoma, and in the northeast/north central area I've seen exactly 1 in the last 5 years. It was hit by a truck and dead on the side of the road. I'm sure there are more, but I don't know where. One of the guys I turkey hunt with has shot them in the central part of the state. He's even recruited my help to hunt them on his leases. Plenty of sign, but I've never seen a live hog there either. I have seen them on the western side of the state (Roger Mills county) in the Black Kettle National Grasslands. You might be able to put together a turkey/hog combo, but I'm not sure about the regs/legality of hog hunting in the grasslands during turkey season.