Since this is a father/son project, will leave a link to Wiki's Texas' amphibian article for you two to look at. Reads pretty good to me and does have links to individual species articles with pics that could help narrow it down. In the meantime we will wait for your picture posting and try to ID the toad. Also, be advised the Houston Toad (endangered so protected by Feds too) and the Mexican Borrowing Toad (threatened) are state protected: TPWD: Nongame and Rare Species Program - Federal and State Listed Species .