Hello.
Do you happen to have a picture of that? Is the saliva clear in color or more like a mucous
instead?
Some excess saliva is normal, but too much or if it is really thick & off colored then he may
be developing a respiratory infection of some type. Can you review your tank setup for us,
such as the type/brand of UVB, temperatures, substrate, nutrition/supplementation & foods
for him so we can be sure everything is all good for him.
If you have any pictures to post of him along with the setup, you can post them, too.
Tracie