Spruce wood planks and mossy stone bricks don't exist in the /fill command

Working as intended. Spruce planks and mossy stone bricks instead use data values subset from other block types. To place spruce planks, you would use '/fill [XYZ] planks 2'. In this command, 2 is the data value being, which is for spruce. This is the case for all other wood types as well. For mossy stone bricks, you instead use 'stonebrick' with data value 1.