Can I buy an iPhone 14 Pro with regular SIM tray?

Yes, if you purchase from Apple or an authorized dealer outside the US.

You can ask, but you won't get one.

All iPhone 14 models sold in the US are eSIM only. No physical SIM tray.

No, there will be no models sold in the US with a Nano SIM slot.

All models sold in the US will be equipped with dual eSIM capability.