I raised a big lot of hatchery quality (nothing special) Black Jersey Giants years ago.
The chicks were black, extremely cute, and sometimes had a white head spot. There weren’t any that were yellow, gray, brown, or chipmunk-striped. Not even close.
They grew into great big slow-maturing tall chickens that had a huge amount of tasty, traditional leg meat. The roosters’ crow was deep in pitch and pleasant to hear.
The white head spot may have been a hatchery defect (Barred Rock admixture maybe) but it certainly was not a complete misidentification like claiming these chicks to be “Jersey Giants.”
I don’t know what those chicks are. Sussex? Wyandottes? Orpingtons? Some sort of Cornish variety? They aren’t Jersey Giants! The white variety would be lighter.