How to pronounce “cockles” in English

There's cockles that everybody calls cockles, and then there's real cockles.

So oysters grew from slimy mud, cockles grew from sandy mud, limpets grew from rocks, and so on.

And then if you look at page 168-- I just thumbed through there-- we were singing about cockles and mussels, and we got all kinds of cockles and mussels

Well, that warmed the cockles of Galen's heart because he, in fact, had not written the book.