Is there a corner joint for boxes, drawers, etc that is made with three
pieces: the two parts plus something like a loose tenon?

The only thing I can think of is something like a spline joint but I'm
wondering if there is not something a bit more artistic and strong. I'm
imagining something you could make on a table saw that would look
something like a dovetail joint. It could made of different woods for
contrast.

Anybody? I am making any sense?

Thanks,

Jim