Well, seeing as some of those taxa are not on iNaturalist (I just checked), they wouldn’t be able to be identified to species anyway. Your Gompotheriidae would be stuck at the taxonomically unranked Elephantida, and your giant ground sloths comprise several families of Folivora – and two users with the usernames Mylodon and Mylodont.
All three species of Mammuthus are on iNaturalist, though, and so is Bison latifrons, so there is that…