If you watch the first one and notice the shadows and background plants, the time of day is changing per photo as the wind moving the position of the plants.
They are essentially changing the position of each object before each photo.
Then merging each photo to create a video.
you may want to search animated video, or something more specific of this type as I cannot recall the specific technical term.
But this is *not* stopping motion. If is taking a photo of a "set/placement" of objects. then those objects are moved ever so slightly, then another photo. Over and over again. Then all these photos are put together in a photo video software to create a video. It takes a lot of time. Just the first one looked, from the movement of the sun/shadows to have taken at least all day. This excludes creating a storyboard, planning, test runs, etc.
someone who knows more about this may be able to provide more specifics.