Maybe there’s something for you 
https://hofk.de/main/threejs/skeleton/03_skeleton.html
https://hofk.de/main/threejs/Hummel%20Mara/14_hummel_bumblebee.html
Comments unfortunately only in German, but easy to translate with deepl.com/translator ( I always take).
https://hofk.de/main/threejs/skeleton/00_skeletonBasic.html
https://hofk.de/main/threejs/sandboxthreef/formLibrary.html
to the addon see THREEf geometries and Addon. Produces almost infinite many time-varying geometries with functions