LongearXBG would be my guess, and its environment (diet & water conditions) gave it those colors. Sunfish (I know all the regulars on here know this) can look very different from one water body to another.
Def not a Pumpkin. They are not native to Dallas.
Cool fish though, I would have come to pick it up and put it in my aquarium.
All that being said, Rudy fishes tons of Dallas creeks and knows his stuff so asking for a fish ID means this is a very unique fish.
Don't worry about the mule, just load the cart