I'm not sure why but these "feel" like neuter nouns, so I'm guessing it would be "το ποπ κορν"?
Thank you. I assume the declension in this case would only apply to the second word?
~>3,599 BCE • 1st corn pop made when seed corn got too close to the fire
3,600 BCE • 1st known popcorn • Corn was first domesticated about 10,000 years ago in what is now Mexico. Archaeologists discovered that people have known about popcorn for thousands of years. In Mexico, for example, remnants of popcorn have been found that date to around 3600 BC. · Popcorn