Young males can also have egg spots so that's not a reliable way but he looks like a male to me, body is too streamline to be a female. But yes you can feed up to how much he'll eat in about 30 seconds or so. My little boy Aero was tiny when I got him and I actually had to split up my NLS pellets to feed him. Now he takes one whole and I feed him about 8-10 pellets in one day though, then he's got the rest of the 24-ish hours to digest and metabolize his food so I have no worries of constipation/bloating.
It's really hard to overfeed Omega and NLS, like you'd have to give them 20+ to do that so you can feed right up to 10 pellets in one sitting just fine. I do prefer doing one feeding a day so that they do have that 24 hour period, it makes it easier on them. But you may want to split that up to certainly fatten him up and then once he's stockier then you can go to like 6-8 pellets a day. For most of my young boys I do 6-8 pellets, older boys that are a year and older get 3-4 and then my constipated DT gets 2-3 a day
He'll be fine once you feed him more and no worries bout resurrecting a thread, I like when updates come along!