Wolf's fart (frozen)

 The ground was still hard and frozen...

...the greater the pleasure, therefore, to find stone cold common puffball

 Lycoperdon perlatum which means "Wolf's Fart"!

Lycoperdon perlatum. Vorterøyksopp.

Common puffball.

Edible if white and firm inside.
Remove the prickly outer layer.

Lycoperdon means wolf's fart in latin.
So now you know...