Do corpses left over from dead creatures create difficult terrain?

@JeremyECrawford Do corpses left over from dead creatures create difficult terrain for the purposes of movement in combat?

— zerosius (@ItsSteffen) October 6, 2016

As DM, I treat corpses as difficult terrain. #DnD https://t.co/ApYMZ6BeRE

— Jeremy Crawford (@JeremyECrawford) October 6, 2016

@NoahTopper @ItsSteffenThat’s dark. It is!

— Jeremy Crawford (@JeremyECrawford) October 6, 2016