They have the exactly same pronunciation as that of 平

The component 平平 is so loyal!

All these characters with the component 平 are pronounced the same as 平 píng. As for their meanings, just check the semantic parts, e.g 枰 = 木 + 平(枰, a kind of tree),鲆 = 鱼 + 平(鲆, a kind of fish).