The “cross crescenty” was termed un croix à croissants in period French blazons. It’s found in the arms of Tadyngton, c.1445 [DBA3 128].
Gregor of nan Crioch Tuatha bears: Gules, a cross crescenty quarterly Or and argent.
Celestria of Celtenhomme bears as a badge: Purpure, a cross crescenty argent.