will the unfoil card work on frosted characters? as in take off the forst

I don't have tested it.
Why do you want to un-frost your characters ?

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Collectionneur de cartes

as a noob i frosted lady yilith thinking a frosted one would sell for more. probably not used her in near a year. its just wasted revenue

Lady Yilith Frost version is level 4 which is collector and then, unsellable.
Unfoil card will not change anything about this, the card will stay level 4 and unsellable.
There is no way to level down cards.

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Collectionneur de cartes

ok thank you