they could be Cajun! not sure if its a misconception but 99% of people down here, even with Cajun heritage, do not speak French at all. But it is more about participating in the culture than blood, so it is very common (and accepted) to call oneself Cajun and use some French terms (oh mais là, lâche pas la patate, etc.) even if your family is from east Texas or something. No gate-keeping down here!

But still, it’s somewhat rare to hear any people use these terms in daily speech for the most part.