not familar with the term..

what food is considered frankenfood?

afaik it's low carb versions of high carb products - eg stuff like chocolates where the sugar is replaced by sugar alcohols or other substitutions...
Alternatively I think it could mean highly-processed foods...

The actual meaning of a frankenfood is genetically modified food. On this site however, people use frankenfood to mean a highly processed unnatural food item (hot dogs or sugar free syryps are good examples)

so that would mean lc bread, lc tortillas, atkins bars, sf jello, splenda, sf candies, that sort of thing?

To me the LC tortillas are ok because they just have flour and natural ingredients. What I consider frankenfoods are the ones that have been processed in a lab. The protien bars with high carbs that supposedly "don't count". The sugar alcohols that can reak havoc on the system. Some LC cereals, powdered milks and so on.

I limit myself. I lost all taste for the bars and will usually just have a morning one maybe in emergancy (haven't in 2 months or so) I do have some keto crispies I will have rarely as well. Most products though just are too expencive and aren't that tempting looking. I always think I can make better at home for less carbs and cheaper. (course the whole I'm lazy part means I rarely actuly make them)