As far as I know pigs are considered varmints in TX..
So I would think that you could. I guess I am asking myself, "why would you want to?". Many moons ago when I was much younger, I took on a herd of swine with an AR15 and 30 rnds of justice. They were eating a deer I had hung in a tree. I let loose with all 30 rounds and did not drop a single pig. Later that weekend the buzzards led me to a couple of pigs that I had wounded and subsequently died. I felt like a jerk for not putting them down cleanly. Please learn from my mistake. I am not saying don't use your AK, but think of the ammo in you magazine as extra ammo for a follow up shot or for other targets once your orginal animal is down.
Hope this helps you out.
Credo Quia Absurdum!