Just taking one example (AngelScript), it's not really "fledgling" (not even sure the meaning of that, but it says "This site provides a list of programming languages which are just starting out in the world."). It's been around since 2005... Maybe it's just "a list of languages that I've just started to read about recently".
Neat in the end, but should do with more information on how they were recognized as "fledgling".
EDIT: found the criteria (doh!) http://fll.presidentbeef.com/criteria and I searched "fledgling", AngelScript doesn't fit that category, it's a mature language used in lots of video games. If a language doesn't have a book written for it doesn't mean it's not "popular"...