Well, then you get into the whole "what is a pole-arm?" question and we are slap bang back into the minefield of weapon nomenclature. The weapon in question is basically a short hafted glaive (and to illustrate the hazards of weapon nomenclature, it is probably worth mentioning that "glaive" in medieval French could be used to mean "sword", typically in poetry, or "spear"), but note the frequent depictions of long handled battle axes being wielded two handed from horseback in the same source material. That said, if we have to fall back on "near pole-arms" then there probably is no real evidence for "true pole-arms" wielded from horseback.