Example of trees, shrubs and grass animated using IGToolsPP: Speedtree to Pivot Painter 2.0 plugin.
IGToolsPP is a plugin to import SpeedTree models in UE5 as vertex animated nanite static meshes (Pivot Painter 2).
Available at https://artstn.co/m/RpPpN and at https://www.unrealengine.com/marketplace/en-US/product/igtoolspp-speedtree-to-pivot-painter-2
Another example for IGToolsPP plugin