I would call them by their proper terms? Such as splashed white, frame and sabino? And if they were present with tobiano, I would still call them by their proper terms. So "tobiano and frame" etc. "Overo" and "tovero" are antiquated terms, and with current knowledge are no longer needed. To persist in using them is backward of the registries. The continued use of indistinct terms is dangerous to horse health as well, as one of the genes responsible is lethal in homozygous form, and so thus should always be named outright. To not do so lets it slip under the rug and be forgotten about.