Background Pony #52BA
This one has perfectly smooth legs (with semi-realistic joint shapes) but is still tagged “fetlock tuft”
Well, that’s just mis-tagged no matter how you look at it.
There also exists a tag shorn fetlocks but that looks like it was initially meant as a joke for images of show characters who had scalloped hoof separation (Big Mac, Shining Armor) edited to a straight line.