ハロ Haro

Per Spiderpiggie (thingiverse.com/Spiderpiggie/designs):

An FDM printable Haro model, with articulated ears and opening "mouth". Use it as a container, a prop, or a component for another project! Fusion 3d file is included for easy customizing.

The entire project can be 3d printed, although you will need some glue if you choose to do so.

The pegs on the ear flaps are roughly 3.1mm, you could replace these with a wooden dowel of around the same size. If you choose to use no extra parts, you will need to superglue these pegs in place after positioning them in the top shell. Alternatively, you could use a spring.
   The body hinge parts can be fixed in place with screws, or good old superglue.

Be sure to test fit all parts, and make sure you understand the assembly before gluing anything.