I don't have a lot of Crotons, but have a few from cuttings we've seen around town. This one is finally ready for the ground. However, I have no idea if it is a "common" cultivar, or hopefully something a little "special." There is no telling what I could come up with over here.
It looks to be Van Buren pretty much available in the trade. Very nice great grower lots of color. I have it in partial sun it likes regular water and fertility. Will show new growth and color all thru the year. That is my guess on your plant.