The innumerable Craugastor species can be extremely difficult to distinguish, and I'm not enough of an expert to be very confident in any Craugastor ID. However, this is in range for C. bocourti, has an ear opening less than half the width of the eye, and looks like a dead ringer for the photo of C. bocourti in Köhler's Amphibians of Central America, so I'm feeling pretty good about this ID.

Here is a list of all the reptiles and frogs I saw on this trip to Guatemala.