Yes, they have. For now you can only butcher or (if I didn't cut it) sell them or they run away. But in future versions I will add new building and/or upgrade - monster den - where you will be able to use them as regular farm animal (mostly like pigs without meat). I also planed that they will be able to build their own building - bug nest - with additional events and interactions for player (same plans for tentacles, bees, goblins (maybe) and other "funny" monsters).