The coupon does not state "participating products" It states  participating brands.

That is good though

Participating products would be just as shown, participating brands would mean the brands like Ritz not just ritz crackerfuls

. A brand is a name is not a flavor or style so you can use the coupon on any thing by Honey Maid , Fig Newton, Ritz , Teddy graham, snackwell, wheat thins, 100 calorie snacks or triscuit.

The wording is weird on there part but I will use it on any brand flavor or size as I mentioned above, but not on oreos, chips a hoy  or other Nabisco products .

I interpret any things that says brand as something that hold a trademark to own that name. For example How to Shop for Free is a brand because it is trademarked. 

With that said here comes the confusing part. 

Ritz is trademarked making it a brand, and Ritz bits is also trademarked making it a  brand therefor my theory would squash getting ritx bitz with the coupon.

According to the Nabisco website  Newton is a brand and it doesn't clarify whether newton thins is so by that wording anything in the Newton category would fall under the term brand and be allowed to use the q on. 

Now 100 calorie snacks is on the coupon as a brand yet it isn't shown as a registered trademark , to make it more confusing 100 calories comes in Oreo..

Who's confused? 

I would call this a grey area coupon that Nabisco failed to leave clear instructions on. I personally would not use this on Chips ahoy or other brands that are not listed but I would not call out anyone that did as doing something wrong.