Queen Maud was a Rat Creature queen who lived centuries before the events of Bone and the queen of the Rat Creatures during the arrival of Big Johnson Bone. She is the Rat Creature who created the tradition of chopping off baby Rat Creature tails after her embarassing defeat at Johnson Bone's hand.
Since King Agak commented on old Doc Guam giving him advice for his gizzard. which means he is still alive. Since Queen Maud and Tyson are young they should be alive.