Q. Is a peer-reviewed article the same as a peer-reviewed journal?
A peer-reviewed article is published in a journal. There is a type of scholarly journals that only publish peer-reviewed articles; this is what is most likely meant by "peer-reviewed journal".
If you're looking for peer-reviewed articles, a good general place to search is Miner Quest. Check the "Scholarly (peer-reviewed) Journals" box on the result page to ensure that you only see articles that are peer-reviewed (pictured below).
See the links below for more on what peer-reviewed means.