(I assume you're talking about the lower frieze in the gallica.bnf.fr image)

"Leaf and Dart is the technical term for it, I believe --I've never seen it in French (which doesn't mean anything).

http://buffaloah.com/a/del/506/source/9.html

Although I'd say that the "dart" has been replaced by another leaf form in that example (as well as the one you posted).

Here's a real Leaf & Dart:

http://buffaloah.com/a/del/690/add/source/20.html

--------------------------------------------------
Note added at 1 hr (2014-02-12 16:17:00 GMT)
--------------------------------------------------

The replacement of the "dart" by a leaf seems to put this genre of frieze in the neighborhood of what this site

http://buffaloah.com/a/DCTNRY/l/leaf.html

calls "Lesbian leaf: distinguished by a prominent center rib"

However, since proz.com is a Family site, I'm not sure whether we can use that nomenclature or not.

Google the term and you get some hits which are pretty close to R-rated:

http://tinyurl.com/lcwdpu7

--------------------------------------------------
Note added at 1 hr (2014-02-12 16:22:31 GMT)
--------------------------------------------------

The terminology of your souse, Tortola, is pretty sloppy.

The upper frieze in the gallica.bnf.fr image isn't made up of "oves" (oeufs?) at all --it's rather closer to a "bead and reel"

http://www.pitt.edu/~medart/menuglossary/beadandreel.htm

I assume we are talking about a post-medieval convent here?