@fishin,
												I get the town's descriptive term.  Kettle ponds are not (or are not necessarily) moving water - no spring in, no leakage out).  Yet they somehow sustain water levels (rainfall only in some cases?) and their own ecology.
Anyway - all ponds on the Cape aren't kettles, I don't think.  Though the ponds that aren't that I can think of, are man-made and usually involve us mucking around with the natural salt-water inlets.