Definitely an oak, but I don't see any of the characteristics of Pin oak in your pic, other than lobes have pointed ends, not rounded.
--- Pin oaks have tapered lobe widths as the lobe extends, certainly not expanding as you pic shows.
--- Pin oaks have wedge shaped leaf blade bases or maybe rarely the base margin is straight, at right angles to the leaf stem. Certainly not cordate, like an upside-down heart shape like the pic shows.
--- Pin oaks do not make the C-shape empty space between the lobes of your leaf. They make U-shapes or V-shapes.
I can't venture an ID guess for you, sorry, I don't know the oaks that might grow in Texas. I will say that oak species hybridize with each other, even in the wild, and even on the same tree, leaves can look very different. It's important to have as much info as possible for a proper ID. Location, pic of whole tree, branches, branchlets, buds, variations in leaf forms, acorns, bark, fall color, etc.