What major part is missing in the frog's skeletal system?

There are lots of similarities in human and frog skeletal system, but still there are differences between both of them. First, the frog and human both have skull, but frog doesn't have neck that's why they can't turn, lift, or turn their head like people can. Second, frog doesn't have ribs. The rib like bone you can see in their back is just a part of its spine.