Pigs reproduce rapidly, but it would take a while for them to increase to the point this would happen. The tribes learned to eat pigs pretty quickly, too.
In general, introducing an exotic species can have lots of effects.
And thus Barbecue was born!.................
The Tulsa World Sunday Magazine, sixty years ago, used to have a cartoon about early American life and it mentioned how the Indians, when on a raid, often ate the pork of the settlers they had attacked.
A magazine published about Arkansas, about 20 years ago had a great article on hog proliferation in Arkansas, from the first explorers who had some escape, till they found, on their return, the Indian tribes having problems with pigs destroying their crops.
In other news, the Mandans had a problem with a new creature undermining their homes, the RAT.
During WWII many people in Texas raised pigs because they were cheap, prolific breeders and Armour had a processing plant in Fort Worth. Lots of hogs were made into spam for the US troops.
It was easy to build a pen, buy a few dozen pigs and feed em scrap. Problem was the pigs get hungry. Cheap pens would not hold ‘em, so out they went.
The really cheap pig ranchers just used nose rings to hold them.
Just like those nose rings your daughters and granddaughters wear!!