Hi Optimus, I've never heard of that. As far as I know, the P's in supper are P's and have nothing to do with F's. a B is a vocalized P (your throat vibrates), a P is a unvocalized B (your throat doesn't vibrate) a V is a vocalized F (your throat vibrates), a F is a unvocalized V (your throat doesn't vibrate) But B's and P's are not related to V's and F's.
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OptimusHello. Is there a such thing as 'f' made with both lips closed?Not in English.