Here in CA, we’ve had feral hogs ever since the Spanish came. Then in the 1920s someone introduced wild Russian boar to hunt on their ranch near Big Sur. Now pretty much all the hogs are hybrids, which are very tough, disease resistant and tasty. Best of both worlds, as it were. IIRC, the feral pigs have 36 chromosones, the Russian boar have 38, and the hybrids have 37. They can all interbreed.
The feral pigs in East Texas (and a lot of other areas of the South) are very different. They are first or second generation from the farm and generally rut in swamp and backwater areas.
We do have wild hogs and other wild pig species that is what you are describing. The feral pigs I’m referring to is a recent, and nasty infestation almost like rats.
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Sounds like a party...
The same thing happened here in Florida. The original and still a lot of their dna exists are hogs which DeSoto brought with him. Then we had a lot of farm animals run loose before Florida had a stock law. Back then you had your own notch registered. My Father had his own.
Then on the Eglin AFB reservation they brought in large numbers of those Russian and German boars and released them. What we have now is just a mishmash.