I agree with Bruce and Carlos.

They do eat less as they mature so it is not uncommon for him to not eat for almost a week, but I will say going two weeks straight is a little odd without wanting to eat, but as long as he appears healthy and doesn't act ill you should have no worries.

No having a bowel movement can be bad so give him a warm dechlorinated Honey bath. Make a 80° bath half the height of the frog and add a table spoon of honey. Soak him until he poops feel his right side. If you can feel a solid lump then he needs to go. Massaging in small circles helps(if he will let you safely)

Keep us posted.