Sorry, I don’t know if this technique has a name. However to me it looks like they are just animating still photos like they are a cartoon character. Take a look at these tutorials and I think they will get you pointed in the right direction:
https://motional.net/learn/afx/2d-character-animation-after-effects
By the way here is a spot I did with vector characters and you can see that the same idea applies to if they where photos of people:
https://vimeo.com/89146724
Hope this helps and best of luck.
Stephen Smith
Utah Video Productions
Check out my Vimeo page