So I've noticed that we don't seem to have a tag for tails with a distinctive puff of fur at the end (example: post #3136047). While I wouldn't say that this feature is very popular, it does show up in enough different examples (ex. lions, trolls, baku) that it can't be neatly found by searching "x_tail".
My suggested tag for this is tail puff. I am open to better names, or to being bapped on the head and told that there is a tag for this that for some reason doesn't come up under "tail_" tag suggestions.