I'm not sure what those are but I am curious. I took my cousin's daughter to an auction 2 wks ago looking for silkies for her. She won a box of assorted "feather footed chicks" Six I can identify as silkies and/or cochins. The last has me stumped though. It's easily twice the size of the bantam chicks so I know it's a large fowl. Feather feet and a pea comb. Feathering in pure white. I'd swear it's a brahma chick except for the color. And they're supposed to be no mixes in this assortment.
I will have to get a pic of the chick in question. But so far it's looking like yours.
How many toes? Sultans have 5 toes, vulture hocks, and are all white. Massive foot feathering. They are bigger than silkies, too.