No idea what they're called or if they even have a name but I've seen a few videos of Mikhail Koklyaev doing them in a compilation video.
You basically wedge your feet under something and lie flat down on the floor in the bench press position holding a barbell above you. You then perform a sit up and raise the barbell above your head as you're doing so.
Looks easy and the weight feels ridiculously light until you actually perform the movement at which point you realise it's not as easy as it looks and lower the weight