it almost looks like a grass pickerel to me,however a tiger muskie which is a cross between a northern pike and a musky can have patterns close to that.
I looked into it and I guess people are calling them striped northern pike. I still don’t know what causes the stripes or how common it is. I watched an episode of uncut angling and they catch one similar to the patterning on my fish. https://m.youtube.com/watch?v=9cv2gVIDsUY
There are three northern pike color phases spotted, silver and striped. What you have there is a striped pike and it is also the rarest if the three. Here’s a link to an article written about Spirit Lake in Iowa. http://kwqc.com/2016/04/04/rare-striped-northern-pike-caught-in-iowa/