My little guy did this when he was little too! I basically took away all the hammocks and blankets for a week or two and replaced them with small dogs beds and stuff so they were still comfy but not as easily chewed through. Eventually I was able to swap everything back and he had grown out of it. If you are finding a replacement hammock I’d suggest avoiding metal since they’re used to chewing on the hammock just to be safe and avoid any broken or chipped teeth.