In response to post #112574398.What version of DynDolod are you using? Did you check the ultra trees option?
This mod doesn't have billboards so we use the ultra option to get full 3D models for the lod.
Alrernatively you can run xLodGen to generate billboards for the trees prior to running DynDolod.
The above is a feature of version 3.0 and afterwards.