Frenna was a female shrew member of Guosim under the leadership of Log-a-Log Luglug and Osbil. A mother, she was known for making a successful sleeping potion. Frenna instructed young shrews not to drink it, knowing that they would.
During the Battle of the Plateau, Frenna led a group of Guosim shrews. As she was a minor character, nothing else is known.