Q.Hameln dwarf fountain grass
I live in northern NJ and planted like 5 of these plants last spring. They looked amazing. Now it is June and since cutting them back, they still look like a pile of straw. Will they come back and what, if anything, can be done to make sure they do come back?

Wait and see is still the best approach due to the harsh winter.
Do you see any green growing down in the plant crowns?
My grasses have been very slow and we are seeing reports of the same from other gardeners.
If you see none within the next few weeks you will need to replace.