It's definitely cute.. Looks like it may grown up white? I have a few back yard mutts and when one of the chicks pops out yellow(it doesn't happen often).. It is white 99% of the time.. I did have 2 that turned out a speckled grey looking but they had a blue hue as chicks.. I know that doesn't help much with breed..
I am not hugely experienced with sex links but I know that there's something about that mark on their heads.. Maybe it's half? I'm not sure if a hybrid would still have the spot or if it could be using to tell gender.. My Norwegians had that spot too only much more obvious.. Did you hatch it or buy it?
Now those grayish looking ones look like some I hatched last year.. They are EE crosses of some type.. I'm gonna see if I can get a pic before it gets completely dark on me..