I don't really like any of the submissions with -lusk at the end. In these names, unlike with the word "Mollusk", the emphasis is put on the "usk" sound at the end. I think this sound really doesn't suit the personality of the pokemon, plus it makes me think of "Musk" which really has nothing to do with our snailmon. "Mollux" doesn't fall into this category, since the emphasis is on the "Moll" sound. Lux is also lighter sounding that Lusk.
Since my last post, I'm also really liking Nitropod. It's kind of cute but also a little bit badass. Perfect.