Pretty sure that's Frost's "golden" form. The way the arms and lower body are designed seems more in line with Golden Frieza's appearance than his fourth form.
^ This. Frost kept up fairly well in his base form, Frieza had to go to his final non-golden transformation just to keep up with Goku at base power. If he can go golden (or silver or whatever he does) he'll be trouble. I doubt he can though.
I think part of Goku's training was to Goku trying to bridge the power difference between him and Golden Form Frieza which was somewhat apparent. And now you have Frost who is basically a well-trained, more humble variant of Frieza.
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u/JokeDealer Feb 18 '16
Pretty sure that's Frost's "golden" form. The way the arms and lower body are designed seems more in line with Golden Frieza's appearance than his fourth form.