pink tongues are not that rare, see a few around for sale, I am suprised they are not more popular they are such an easy and good looking animal to keep.
for geckos they would be fine in wood enclosure if its escape proof and doesnt over heat / not heat up enough. if he wants a gecko, he can always see go with a leaf tail, though they do not move at all lol. Oedura species are the ones to get, marbled velvet geckos are probably the most popular, because of the size and the beautiful colours.
edit:
nobbi dragons are not kept that much, they ar a lot like jacky dragons and yes they will climb, but will also spend time on the ground like a lot of other animals.