There are so many lego Baby Yoda builds out there, and this is one of the best. This cute little guy was built by hachiroku24. It is completely made out of Lego parts. The key pieces are the ears, which are from a recent Lego Elves set (part 11089). They did make a small cheat, the 2×2 rounds with a hole, near the ears, have been photoshopped to match the rest of Yoda. Below you can see him being built.
Check out the Lego Baby Yoda building instructions above, in a handy YouTube format, which can also be found here: https://youtu.be/SgIMLmKoOGU
You can also find hachiroku24’s Flickr page here, full of a ton of MOCs: https://www.flickr.com/photos/hachiroku24/49178685288/