Gulf Coast Toad

looks most like a gulf coast toad to me

I'm not seeing a dorsal line running from the back of the head down the middle of the back towards the tail, so I'd be a bit leery of calling it a gulf coast toad. I'd look for patterns (such as the aforementioned line) rather than color, which can vary a lot within a species. It might just be an American toad and we're making this too hard...grin. Perhaps there is someone else that knows more about amphibs that can help.

The following webpage may be of use: http://www.tpwd.state.tx.us/learning/texas_nature_trackers/amphibian_watch/amphibian_species/ . Take a look at let us know if any of these might be the creature you're holding. Keep in mind that what you have may be a young and smaller version.