Can you Put POD onto Warbonds??? OR are they not sold like that?

If you make the bonds payable on death directly to someone then they do not p through your will. This is called beneficiary designation and it's done all the time in reference to life insurance policies. Life insurance and other pay-on-death things are paid directly to the named beneficiary, and it is up to the beneficiary to claim the death benefit otherwise the stuff will just sit around forever.