No, jaguars are protected, even in Texas even though they supposedly don't live in Texas.
Jaguars native range includes Texas, where they historically have lived, though it's been decades since the last confirmed animal. Hence, there is no current population, though jaguar sightings have been confirmed in New Mexico recently.
There is no melanistic cougar, a large cat we know exists in Texas.
The incidence of melanistic jaguars is like 1 in every 10,000 animals. So given that there MIGHT be 1 wild jaguar crossing into Texas every few years (none have been confirmed the last I checked), people factually are not seeing "black panthers" in the woods. Yes, I know your dad/uncle/best friend/brother is an honest person that wouldn't lie and swears they're all over the place, but they're wrong.