I'm thinkin' mebbe I should rename those Appaloosas to "Techtonic Plate" tigers. Because the pigment patches remind me of geography more than spots. Well, at least right now. I know if I keep going in this direction I eventually get more toward Appaloosa, but right now the spots are more like plates.
Maybe call them "Tobiano Tigers" instead? "Tectonic Plate Tigers" is a bit wonky :P "Tobiano" fits with the horse theme you started with "Appaloosa" and rolls off the tongue a bit more easily