Dr. Thomas F.L. Parrott was born about 1804. In the summer of 1832 Parrott joined the schooner Brazoria near Fort Velasco and served on it during the battle of Velasco (June 26–27). In early 1833 Parrott was one of fourteen deputies from different parts of the Municipality of Brazoria to participate, by invitation of alcalde Henry Smith, in a convention that adopted the civil code of Louisiana until the state laws of Coahuila and Texas could be received and translated.
At the Siege of Béxar he commanded an artillery company. At a council of officers of James Bowie’s command, held on November 2, 1835, below San Antonio de Béxar, Captain Parrott cast one of only two votes favoring an immediate storming of the town and voted against the division immediately uniting with the main army. In a letter to Governor Henry Smith on December 1, Capt. James Walker Fannin praised Parrott for his experience as an artillerist. Parrott was appointed a second major of artillery in the regular army by the General Council on March 10, 1836. He entered the army with that rank on March 22. He died probably in early 1839.