A poetic/literary term for "Ice Age"? [closed]
Solution 1:
Fimbulwinter. In Norse mythology, it is the mighty winter which precedes Ragnarok - the war that ends the world. It is an image that has been used often in Scandinavian literature since - and some SF and Fantasy English Language writings.
Solution 2:
You probably won't find any non-mythological terms in English. The whole idea of Ice Ages having happened in the distant past didn't really get figured out until the late 1800s, so it's pretty unlikely that Shakespeare or his contemporaries would ever have come up with anything to describe them.