Here you can find a lot of swamp tussocks meshes which you can use as on the ground as on the rocks and walls, also included four sets of textures which you can mix on different meshes.
Support, URP and HDRP shaders are here:
Triangles counts:
SwampTussockFloor_1 - 5678 triangles
SwampTussockFloor_10 - 2948 triangles
SwampTussockFloor_11 - 388 triangles
SwampTussockFloor_2 - 6812 triangles
SwampTussockFloor_3 - 3952 triangles
SwampTussockFloor_4 - 4710 triangles
SwampTussockFloor_5 - 4298 triangles
SwampTussockFloor_6 - 2682 triangles
SwampTussockFloor_7 - 3472 triangles
SwampTussockFloor_8 - 798 triangles
SwampTussockFloor_9 - 1968 triangles
SwampTussocksSmallE_1 - 96 triangles
SwampTussocksSmallE_2 - 144 triangles
SwampTussocksSmallE_3 - 144 triangles
SwampTussocksSmallF_1 - 2160 triangles
SwampTussocksSmallF_10 - 900 triangles
SwampTussocksSmallF_11 - 900 triangles
SwampTussocksSmallF_12 - 900 triangles
SwampTussocksSmallF_2 - 900 triangles
SwampTussocksSmallF_3 - 900 triangles
SwampTussocksSmallF_4 - 2160 triangles
SwampTussocksSmallF_5 - 900 triangles
SwampTussocksSmallF_6 - 900 triangles
SwampTussocksSmallF_7 - 468 triangles
SwampTussocksSmallF_8 - 900 triangles
SwampTussocksSmallF_9 - 900 triangles
SwampTussocksSmallW_1 - 756 triangles
SwampTussocksSmallW_10 - 216 triangles
SwampTussocksSmallW_2 - 504 triangles
SwampTussocksSmallW_3 - 504 triangles
SwampTussocksSmallW_4 - 972 triangles
SwampTussocksSmallW_5 - 972 triangles
SwampTussocksSmallW_6 - 972 triangles
SwampTussocksSmallW_7 - 504 triangles
SwampTussocksSmallW_8 - 684 triangles
SwampTussocksSmallW_9 - 648 triangles
SwampTussockWall_1 - 3822 triangles
SwampTussockWall_10 - 3858 triangles
SwampTussockWall_11 - 7530 triangles
SwampTussockWall_12 - 756 triangles
SwampTussockWall_13 - 5148 triangles
SwampTussockWall_14 - 2026 triangles
SwampTussockWall_2 - 4016 triangles
SwampTussockWall_3 - 1370 triangles
SwampTussockWall_4 - 3462 triangles
SwampTussockWall_5 - 884 triangles
SwampTussockWall_6 - 1486 triangles
SwampTussockWall_7 - 2156 triangles
SwampTussockWall_8 - 522 triangles
SwampTussockWall_9 - 2540 triangles