From Leopard Gecko Wiki
A Baldy Leopard Gecko is a Super Hypo with no spotting on the head. The Baldy trait was first developed by Gourmet Rodent. Just like the Super Hypos and the Super Hypo Carrot Tails, the Baldy trait is believed to be Line-Bred or Poly Genetic. This means that in order to produce Baldies, breed the geckos with the least amount of head spotting.
This is an amazing example of a Tangerine Baldy from Golden Gate Geckos (Gougeon).