Of course they have, their skeletal system is consist of skull, hyoid, vertebral column, and ribs. The hyoid is a small bone located posterior and ventral to the skull in the neck area that serves as an attachment for muscles of the snake's tongue, as it does in all other tetrapods.
They are almost all spine and ribs. This is why they can move so well. They don't have the restrictions of collar bone, pelvis, arms and legs. Their internal organs are very similar to ours except theirs aren't side by side. They are in a line down the body.