>>20423733The floating animation is explained in the overworld guide on the wiki page, but it's like pic related. It's still only made up of two different frames but the placement is different.
For the first frame of the animation the sprite starts out on the ground. For the second frame you use the same sprite as the first frame but move it up 1 pixel. For the third frame you keep it in the same spot but switch to the second sprite. For the fourth frame you keep it as the second sprite but move it up 1 more pixel. It then loops back to the first frame, dropping back to the ground 2 pixels.