Since sloths almost always have algae growing on their hair, while in polar bears it’s very rare, I would say so. The sloths don’t have hollow hair, but instead unique fissures and grooves on the surface of the hair (the structures are different in the two kinds of sloth).
In the kingdom of protista - things that we used to call one-celled animals and one-celled plants, but which we now call animal-LIKE protists - we find euglena. If I remember correctly from H.S. biology (and that’s along way back) there was a type called euglenaphyceae, which had little green chlorplasts. Presumably, they used those little spots to generate a bit of energy, but they moved around on their own using, I assume, energy from food they took in. Back in the day, we’d say, yes, some animals have chloroplasts. In today’s way of looking at the question, and looking at the world of living things, and the semantics of it all, we’d say, no. xo C.