I just did a google search on "Frogs of Texas", I'm out of my league here, there are way to many for me to try to guess from Iowa. However, if they remain that small I think you can eliminate bullfrog and leapord frog. Toads eggs also hatch into very tiny tadpoles and morph into tiny toads here in Iowa, they probably do the same thing in your neck of the woods.
Sorry, my alligator overloaded my hummingbird
FH
