My initial impression was las vegas / rainwater. There is, however, a lot of overlap in terms of color between rainwaters and trempers, trempers are by far the most common, and the other two lines are usually clearly labeled. In order to be a 100% sure what strain this guy is, you're going to have to do some test breeding.
His tail is a bit on the thin side, but this could just mean he's had a busybreeding season. I'd make him go through quarantine and gain some weight before doing any of the test breeding I mentioned.
Cute babies! The bottom tang is really unique. My double het bell blizzards have that speckled look, but their colors are really dull. Your guy has awesome color, you'll have to post some updates as he grows
-Alice
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