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Frogs do not shed to grow. They shed as kind of a cleansing I guess you could call it. Just to get rid of old skin and get fresh new skin. He doesn't look too small. He's about the same size as my bigger male, Glurmo. I would assume Glurmo is about a year and a half old. I'm not really sure when WTFs stop growing though. I'm sure someone else on the forum has an answer to that question! I think getting another one would be fine as long as it's about the same size. What size set-up do you have? I strongly recommend at least a 30 day quarantine period if you do get a second frog though. That way if the new frog has any kind of disease or parasites it wont pass it on to your frog. After 30 days if nothing seems wrong then you can put them together