Popple is a verb that means to flow in a tumbling or rippling way.
Derived from Middle English, popple can also be used as a noun that refers to a rolling or ripping of water. But it’s mostly used to describe water in the act os splashing or trickling.
For example: Growing up on the beach, I had gotten accustomed to waking up with the sound of the waves as they would popple onto shore. That splashing sound is something I’ve come to identify with my childhood.