The Pale Hanging Moss block should be called "Hanging Pale Moss", as it is the hanging variant of the pale moss, not a pale variant of an inexistent "Hanging Moss" block. Even if there was such a block, as was set precedent by blocks like Dark Oak and even the new Pale Oak, the coloring suffix always stays just before what it qualifies, not right in the beginning of the name like Pale Hanging Moss.