It's a girl, right?

[Jimifrog]

From what I've read here, the nuptial pads are this darkened area of the frog's front feet that help him grip the female during toad's wild ride. There is a darker area on your frog's front feet. I thought that might be the pads.

[Chomp]

looks like a stunted growth male

[Sublime]

Hm, this is a tough one. I'm leaning more on the side of male from the head, but if you haven't heard it croak for 3+ years, that seems a little odd. When you got your pixie, was it underfed at a young age where you picked it up or something you may have not known at the time? The only time a frog would be stunted would be if the tadpole was taken care of poorly or it was underfed at a young age. Where did you buy him or her from?

[MonsterPyxie]

I'm on the fence with this one... but good lookin' frog!

[Mentat]

No idea on this one; but it's a very nice looking frog!

[Mikey]

My vote = small or stunted male.

Which may very well not be your fault. If I notice a few of my grow-ups taking off size wise I tend to give them the most attention food wise, the finicky eaters still get fed as often as the other's but at times may not eat as much. If I had to guess you didnt notice significant growth and assumed it was a female, his / her head is rather big for a female, I can't really tell from the pictures but does he have slightly developed "jowls" or lumps behind his head, I have yet to see a female with those developed bulges.

[Mikey]

Nevermind I change my vote, he is definantly a male at 6inch'es long and having that head. He is just small for whatever reason