I'm going to guess Male as well. Still a young monitor, but from the first picture you can see a crease with shadow following the hind leg that could quite possibly be a developing hemi. As far as them popping out, if they do you will see a 1-2 inch long tube extend from each side. Dark purple/grey in flesh color, and they look like they come from inside out themselves. If that makes any sense. LOL.
Keep me updated on this sale, if nothing works out for you I may be able to help. But for now I have two Male blue phase rudicollis and am looking for a female to impregnate.
In the meantime, feed him a lot more insects. That's why they have that long snout, to pull bugs out of tree holes
