Welcome to the forum. We seem a bit inactive because frankly there's hardly anyone here yet. We've only been around a few months. When your frog calls, does it sound like the call on this page:
http://www.frogforum.net/index.php?p...alus_adspersus
If it does sound like that then it's a male. Looking at the photos, it's either a nicely sized female or a still young-ish male.
Regarding the moss, I actually keep my two female Pyxies with some sphagnum moss, but they never get fed anywhere near it (I hand feed all 3 of my Pyxies). I can't speak with regard to how easily digestible the moss is but if you're unsure about whether or not they eat it when you're not looking (unlikely), then don't risk it.