In game by default some trees animate only once, I changed that behavior. Enjoy
For ashen trees:
doodads\terrain\ashentree\ashentree0.mdx
doodads\terrain\ashentree\ashentree0s.mdx
doodads\terrain\ashentree\ashentree...
For lordaeron trees:
doodads\terrain\lordaerontree\lordaerontree0.mdx
doodads\terrain\lordaerontree\lordaerontree0s.mdx
doodads\terrain\lordaerontree\lordaerontree...
For City use lordaeron trees as base:
doodads\terrain\cityscapetree\cityscapetree0.mdx
doodads\terrain\cityscapetree\cityscapetree0s.mdx
doodads\terrain\cityscapetree\cityscapetree...
For barrens trees:
doodads\terrain\barrenstree\barrenstree0.mdx
doodads\terrain\barrenstree\barrenstree0s.mdx
doodads\terrain\barrenstree\barrenstree...
For sunken ruins:
doodads\terrain\ruinstree\ruinstree0.mdx
doodads\terrain\ruinstree\ruinstree0s.mdx
doodads\terrain\ruinstree\ruinstree...