They do exist in bitcoin, if you didn't know: https://en.bitcoin.it/wiki/Colored_Coins. They don't have the same activity as in Ethereum, because they weren't disgustingly hyped up. They do have a purpose, as said by o_e_l_e_o (BSQ tokens), but I've seen nobody interested in trading bitcoin-apes, probably because people don't find reasonable to trade digital scarcity for hashes of jpegs.