No, Walmart does not notarize papers. In order to notarize a paper, you will need to have access to a notary, who is also usually an attorney. These professionals are usually based in legal offices, not Walmart.
You will usually need to wait for office hours in order to have this sort of work done. Many people ask about notarizing papers at Walmart because this store is open on a 24/7 basis, but unfortunately, it is rare to find legal professionals working these sorts of hours.
Establishments like UPS do offer notary services, so it might be worthwhile contacting your local UPS to find out whether they can get this done for you. If you are interested in other services offered by Walmart, contact customer service right here and ask them.