He'd probably bite your tongue if you tried to lick him... you could try though!
To answer your question about the color change: There is a huge variation of the starting age and duration of the transformation; which is probably why you get so many different answers. Even babies from the same clutch will change at different times and rates.
Average info:They usually start to change their colour at the age of 6 to 12 months. It takes them between 15 days and 15 months to change completely.
Crichton started at 16 months and it took him about a month to change.
Aeryn started at 10 months and within 12 days she was already VERY green... I'm not completely sure she's finished though: she is 19 months old now.
