Have you watched this video? If not, it may help.
You are correct about C-Bet referring to Flop C-Bet. I believe Double Barrel is the same as thing as Turn C-Bet.
I’m honestly not sure if there is a stat for Triple Barrel(To bet Flop, Turn, and River) or River C-Bet at this time.
The UOPFR(Unopened Preflop Raiser) stat found in DriveHUD is the same thing as RFI(Raised First In).
Here is a link to some of the definitions. Please note that not all of the stats found in DriveHUD are listed. You could probably find most of the ones that are not listed in the Two Plus Two forums or with a Google search.
I hope this helped, but if you have any more questions feel free to ask!