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escallop (n.): "scallop shell," also "edge or border cut in the shape of scallops," late 15c., from Middle French escalope "shell," Old French eschalope "shell (of a nut), carapace," from a Germanic source (see scallop). For initial e-, see e-. As a verb from c. 1600 in escalloped "having the border or edge cut out in scallops."
scallop (n.): "bivalve mollusk," c. 1400, from Old French escalope "shell (of a nut), carpace," variant of eschalope, probably from a Germanic source (compare Old Norse skalpr "sheath," Middle Dutch schelpe "shell"); see scale (n.1). The shells of the larger species have been used as domestic utensils. Extended 17c. to objects shaped like scallop shells, especially in design and dress. The verb in the cookery sense, "to bake with sauce in a scallop shell-shaped pan," is attested from 1737. Related: Scalloped; scalloping.
crenate: "(Especially of a leaf or shell) having a round-toothed or scalloped edge", Late 18th century (earlier as crenated): from modern Latin crenatus, from popular Latin crena 'notch'.