Scallop patterns are very common in medieval art (and any art really). They can indicate scales, feathers, fur, mountains, armor and probably much more. On a few VM folios, a slightly enhanced version is used, where many of the "scales" are dotted.
You are not allowed to view links.
Register or
Login to view. and You are not allowed to view links.
Register or
Login to view. both combine plain scales, dotted scales and something tent-like topped by a pole, water emerging from each. The pattern is also used on the two-birds page and to some extent on the rosettes foldout.
Browsing around, I came across an image from the You are not allowed to view links.
Register or
Login to view., of a castle with dotted roof tiles.
All of this is rather confusing. I'd have thought the Q13B dotted scallops must be mountains since water flows from them, but their orientation and color is quite similar to that of roof tiles as well. It almost feels like Q13B, the rosettes foldout and its reverse are patched together from a catalogue of roof and tent images...
Edit: the Wenceslas bible also contains some tents with extremely VM-like cloud band patterns, though I feel like this must have been pointed out before: