Herbs don't expire as in "they are bad for you after this date". However, they do loose their flavour. if you bought the Oregano more than 2 years ago, there will be little or no flavour added to your cooking when you use it.
I'm not sure if they expire but if you see scratches or dents, you would have to change them.
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The Tagalog name of oregano is "dahon ng oregano."
The difference between oil of oregano and oregano oil is nothing! One can use both types and the terms are interchangeable. Oregano oil or oil of oregano are great additions to cooking.
uses of oregano
In Telugu, Oregano is called Vaamu which is known for its antiseptic and antimicrobial properties.
Yes, you can safely freeze oregano.
Oregano is a herb used in cooking.
The herb closest in flavor to oregano is probably marjoram, which is in the same family. It is subtler, though, and lacks the in-your-face aromaticity of oregano.