They co-exist in a vast forest... not in a 20-40 gallon tank and in a tiny pool of water. Your tree frog is going to get eaten or sick. I can assure you that. Seperate them as in this instant the fish and wildlife guy is wrong.

Toads are voracious, even if they can't fit him in their mouths yet. All it takes is one leg caught in a toad's mouth and that tree frog is either maimned or dead from infection or physical trama.

Cuban tree frogs also secrete a toxin mucus from their skin that causes a strong burning reaction, which once gets in the water source can cause those toads stress which can help make them sick or kill them outright.