Trouble taking off security license plate screws

Hi all I just bought a 1997 Ford Explorer & got the back license plate on just fine. It didn’t have any screws in the back so installing was easy. Now the front has these old security screws, if i’m right. They don’t have a top that has an applicable tool (screw driver, bolt head, allen, etc). I was wondering if you guys/gals have experience with these specific screws. I’ll try PB Blaster or a torch to try and loosen it tomorrow at work. The backs seem stuck, only spin slightly & it won’t come off. I’ve attached pictures so you could maybe identify it.