12 Oreos come in a package and we made 16 cookies with one package of almond bark. You can either use a couple from the second box, go a little heavier on the almond bark making more of a puddle and use only one box of cookies, or go crazy and melt an extra package of almond bark to finish up the second box. I suppose it depends on how many snowmen you want to end up with.
If you cannot find White Fudge Oreos don't sweat it. I like them because I didn't want to have to worry about the cookies peeking through but after making these I think they would probably work with other cookies too. You could use regular Oreos, Golden Oreos, or even Nilla Wafers.