A neurological problem is a good possibility as Lija has mentioned. These can be caused from many things. From improper diet and Vitamin deficiencies to coming contact with chemicals causing Toxicosis(Toxing Out Syndrome).

The tongue sticking out could he from Neuroligical damage, infection, calcium/vitamin deficiency, or swelling from biting his own tongue.

I'm going to suggest that you seek a Herp Vet for assistance. Lija is right about the humidity too. 85% to 90% can cause the substrate to become overly saturated and muddy which is very unhealthy for you frog.