The frog shown in the first picture is a male Bullfrog, Rana catesbeiana. The yellowish cast to the skin in the throat region and the diameter of his tympanum (eardrum) being larger than the diameter of his eye are the characters that identify this frog as a male. Females have whitish skin in the throat region and the diameter of the tympanum is closer to the diameter of the eye.
The second picture shows three frogs, the one in the middle is female and the others are male.
These frogs were photographed in a pond that is remote and surrounded by dry country for miles. The soil that forms the mud where they are sitting is Permian age soil. During the Permian times, this part of Texas was the home of large Amphibians, not frogs but salamander like creatures that lived in the swampy country of the Permian.