Grayling is also known as an artic char ..far as I know brrook and lake trout are also char..
I should have recognized the brook trout, but The main colour is darker green than the ones here. We call them speckled trout as well as brook trout.(and I haven't caught one in a few decades)
We had them in the creek that went through our yard, and fished for them all the time. In the summer the creek would get heavy growth of watercress. We would use grasshoppers as bait and the speckled would hit them hard.