|The following is based on Fallout Tactics and some details might contradict canon.|
The komodo dragons or simply komodos are mutated giant lizards found commonly in the Midwest. As the komodo dragons are originally from the island of Komodo and were not naturally found in the United States before the Great War, they likely originated from a zoological garden. Dried and cured komodo hides are used in the creation of leather armor. One possible explanation for the midwestern komodo population is the ability of female komodos to self fertilize eggs allowing a single female komodo to rebuild a population.
The komodos are among the critters controlled by the Beastlords.