Bullet Magnet's suggestions are good. Pretty scientific, but if we wanted a name in a more common talk, maybe we can call the appendages sligs and paramites have, feelers. I believe a lot of insects and arachnids have these, plus it's easier to type.
A scrab's mouth called a beak is fine. It's jaw pretty much looks like a bird beak with a huge lower jaw. I also thought the same thing about Shreks' ears looking just like upright glukkon ears! Why not just call them ears?