Tarantula and Frog

As long as I can remember I’ve found these types of frogs with tarantulas in North Texas. I’m not sure why? I’ve heard the frogs protect the tarantulas eggs from ants and other predators and in turn the frogs receives protections. Not sure if this is true because I’ve found them with male tarantulas. Another theory I’ve heard is the frogs are poisonous and they uses the tarantula for protection and a moist home.