Yes. You will need to create a cultivator and regrow the grass.

https://valheim.fandom.com/wiki/Cultivator

? yes, you can use the lawn 'stamp' to repopulate grass areas and it changes as to where you are in the biome. I've seen reeds popup near water when I stamp and ferns in BF areas--it helps clean up areas that you've terraformed, which removes the grass decals. There is also the 'path' stamp that changes terrain texture.