The tiny Rio Grande Chirping Frog* is native to southernmost Texas and then into Mexico. However, they have been widely introduced into larger cities in Texas and other states. Their chirping calls can be heard any warm night in my backyard in San Antonio, Texas.
This species range is expanding rapidly in Texas. When I lived on the west side of Houston in the late 1970s, I had never seen it. By the early 1980s, it was abundant in my old neighborhood. And the expansion is continuing through both frog movement and our increased discovery of the species.
Here's a map I made in 2015 of the known records for the species in Texas:
In January 2021, I made a new map based on the records available from above plus new records from iNaturalist. You can see how many of the missing counties have been filled in plus how much further north it has been documented. It's range into the hill country is difficult to identify due to confusion with the very similar Cliff Chirping Frog which occurs there.
Here's a closer view of the short call, showing how each "chirp" slides up in pitch.