Is this real?

I wanna try it

Sadly, it's fictional. For now...
http://www.buzzfeed.com/kmallikarjuna/6-ice-cream-flavors-inspired-by-your-favorite-books?s=mobile
.
Some more clever ones in there though, like Clockwork Orange Creamsickle and Whirled War Z.

I thought it said Voldermort's finest for a sec

That reminded me that I have a nail polish called 'Berry Potter and Plumbledore'

I would devour that instantaneously.

Who is 'they'?

Where?!