Toz was understanding of their plight, and was already prepared to mount a resistance against the rats as soon as possible.
If he told the explorers guild about the rats, they would surely not let them be. Toz might even expect a reward from them for making and sharing this discovery.
But there was nothing wrong with some extra incentive from the monkeys, so he gladly accepted the firestones he got in exchange for hearing the monkeys out and being willing to cross the wasteland again.
After Toz accepted their request, Raznak asked if he wanted company during his journey through the wasteland.
All the beasts in the forest had united and created the Forest Alliance to maintain some sort of defense against the rats, as well as raise powerful fighters that could traverse the wasteland. Although, the monkeys didn't have any suitable warriors currently, while the other beasts did.