One of the yellows is definitely not an onomatopoeia. It doesn't make a sound at all.
Also I'm dubious about one the greens - I think it has an extra letter - unless there's an acronym I don't know about.
I think everyone's had a go that is likely to, so we can discuss it. A gargoyle is (or was originally) a decorated water-spout, and the name is imitative of water in a pipe, like "gurgle". A carved grotesque head that isn't a spout is called a "grotesque", though admittedly, as NS says, the meaning of gargoyle has widened in popular usage to cover grotesques as well.
Which green are you dubious about?