Hey
I do not wish to be a problem to anyone, but due to interest I did a couple hours of research and looked at dozens of photos and videos.
Um: The squirrels originally asked about are a completely different set of squirrels as the fox squirrel series of photos. In the end, the ones you found are adorable, and probably it does not matter which subspecies they are.
But the original batch found and questioned involves an inky black underbelly and underchin, with a light, agouti forehead and overcoat. There are no white ears and no white chin.
Sherman's Fox Squirrels have a black forehead, not an agouti/tan one. They most of the time have white snouts and chins (including underchin) and white ear markings.
I hope it is not offensive for me to mention this. I am not trying to be disagreeable. I like to ferret out research when I can and am interested (if I won a superlotto, I would probably want to go squirrel-watching the way some folks bird-watch. I would want to see and take a photo of every kind of squirrel and marking there is. So I was excited to learn about the Sherman Fox Squirrel. I have been sheltered when it comes to squirrels.) If my post rubs anyone's fur the wrong way, I apologize. At any rate, the cuteness factor of the inky underchin and underpelt is off the charts.