Attached Link: http://www.xfrog.com/greenWeb2/Templates/download-xfrog3.html

Jilly, I remember Xfrog has a a willow tree. You may want to download the free full demo and see if it comes with it. Otherwise, there are some other very nice freebie of trees that you may like. Xfrog can export the model to obj format. But since you use Vue 2, may be the couple of trees there in Vue format may be to your liking.