Wild bows I have caught (NW PA) have no spots on the tail. They do, however, have them on the dorsal.
This little guy, though, doesn't have spots ANYWHERE. So forget the fins, there's no spots on the body either! Those patterns on the body are more similar to parr marks than they are traditional "spots" on rainbows.
I don't know enough about rainbow development to know, for instance, how much diet plays into how visible any spots are, or what is typical at different stages of development. Could just have a diet deficient in some nutrient, or maybe most bows have no spots until a certain age. I dunno.
I also don't know on development of goldens/palomino's, if perhaps the yellow becomes more distinct at a later age. So I'm not ruling out golden. Merely stating that the coloration doesn't strike me as being nearly strong enough to even be a golden/regular hybrid.