Quote Originally Posted by Sere View Post
I...The only holes are two little slits on the sides, measuring about 1 inch long by 1/4th inch wide. The frogs are easily the side of a large strawberry, so I can't imagine them fitting through there....
Hi, it seems to me like they might be able to squeeze through a hole that size. Sometimes mine will flatten themselves while sitting on a perch and it looks like they are no thicker then their lower jaw to the top of their head (sorry I don't seem to have a picture), so I imagine they can make it through a slot that appears tiny compared to their normal 'stance'.

You could get some window screen mesh and frame kit from home depot to make your own lid. Not a safe method if you have cats who like to sit on the tank though.