Congrats on your new cuties!
I would guess Pickles is either crossed with Light Brahma or it's in the mix. The color is called Columbian, although this same pattern is called Light in some breeds like brahmas.
Munk is basically a common color out of black crossed with any colored chicken. The closest name could be Birchen or Brown Red.
Thanks for the info. When do NN start laying - the same as other pullets? Is there anything I need to know about NN that is different from other pullets? Or do I treat them the same? They seem hotter than the other girls.