I am not an expert on snows nor do I have one but from what I understand snows have white skin with black spots and are the only two colors it can produce so if they are yellow then they are not snows. Another way to understand it is that they always look like they are going to shed. It is not about the spotting but if it has white skin and black spots and black eyes it is a super snow.
As for the breeding ? yes you would get 50% snow 25% super snows and 25% normal. As babies the normals would be brighter yellow with normal eyes, snows would be whiter instead of yellow with normal eyes and super snows would be whiter with black eyes.
Hope this helped