This is a paid asset, but now you can download WORLD green Pack for FREE, but please remember this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Detail this asset from Unity Store: Original Link
WORLD green Pack v1.0
WORLD green Pack is a low poly asset pack of environments objects, pops and tiles of terrain for create a beautiful Fantasy world for your games.
This pack contain 80+ unique objects : Trees, palms, rocks, mushrooms, flowers, stump, log, chest, tomb, vases, roots, barrel, box, stair, grasses, fence and other objects.
Mesh have ~100-800 tris.
Vegetations and terrain have summer and autumn textures version.
Modular terrain tiles and cliffs.
EZcombiner little helpful script for easy combine meshes for better performants on mobile devices. Ezcombiner detect objects position, separate by materials and create chunks. Add tags, layer and meshCollider if needed.