Yes, wolves can and do eat arctic foxes, although they are not a primary food source for them. Wolves are opportunistic predators with a varied diet that mainly consists of larger ungulates, such as caribou and moose. However, in their habitat, they may encounter smaller animals such as arctic foxes.
In regions where the population of larger prey may be low or during harsh winter conditions when food is scarce, wolves may hunt smaller mammals. Arctic foxes, being relatively small and weaker compared to wolves, can fall victim to them, especially if wolves are in packs and able to coordinate their hunting efforts. This predation is part of the natural food web in the Arctic ecosystem, where the survival of one species can be deeply interconnected with others.