Does this trick exist? If not, what should i name it?

Crank flip

Generally speaking when you make a “new” trick by lumping two existing tricks together it’s just a combination of the names.  

 So the first person to do a foot jam tailwhip didn’t just get to call it whatever they wanted because it was just a foot jam and a tailwhip combined. 

 So this would be a footjam crankflip. Like this person doing a “footjam nose pick crankflip”, which is essentially what you did but on the edge of a quarter instead of flat, but also with the back end up way higher to count as the nosepick. 

 https://youtu.be/0nAd3rulmls?feature=shared

Footjam crank flip