But the point is that the connection between this figure (called "Green Man" by the 1570s and maybe before) and foliate heads (whose medieval name, if any, we do not know) was made in the middle ages, not in the 1930s.

I disagree. The Green Man / Wildman is a very different creature from the foliate head. Those few Foliate Heads shown with bodies, certainly aren't in any way wild or green. It is precisely the otherwise normal nature of the heads depicted as being foliate (both disgorging or otherwise) that makes them so compelling.

Norwich Cathedral, Cloister

Southwell Minster, Misericord