The charnjibber is a creature of Chaos, whose natural shape is unknown. It is usually only found during the dry season, and parts of its shape are baesd on the last creature it swalled, along with a large number of tentacles.
When they first start, they are quite small, no bigger than a rat or a lizard. However, successful consumption will allow it to bring down bigger, and bigger prey. Near the end of the season, they can easily be the size of a dinosaur.
Unless you can destroy it entirely, even death is not permanent. It will just turn into a smaller, chaotic creature.