I have a primarily marine creature that needs to be able to move around effectively outside of water yet still be extremely flexible. My idea is having an anatomy based largely on bony disks similar to vertebrae (shown below) that allow for a semi-rigid endoskeleton with muscular rings that make up the area between the bones allowing for extremely increased flexibility and can tense up when needed to allow for terrestrial movement. This creature's body plan overall is much like that of an octopus or mollusk, with no arms or legs only a cylindrical body and 3 or 4 sets of tentacles with the aforementioned muscle and disk based anatomy. The creature wouldn't reach over 100 kg in mass.
Would this anatomical setup allow for terrestrial movement?