does Texas have the "Lemon Law" or something of that sort for a used car lot selling some one a car that was deemed a total loss and the person not knowing it an buying it?

The Lemon Law only applies to a new vehicle purchase...it is also called a Manufacturers Buy-Back. To qualify there needs to be a major defect, and there needs to be multiple attempts to remedy the situation with no change in performance.

This is a very general explanation, not legal advice.

http://www.dot.state.tx.us/services/...aw/default.htm

If the used car lot sold the car "as is" your probably out of luck. However if they represented it as something it's not, that's fraud. File a complaint with your County District Attorney, or at least talk to them, they should be able to help.