your frogs look very nice and healthy to me so im pretty sure it aint a parasite or anything like that. when exactly did you get this guy? i had a firebelly toad that would just hide and not eat for about 3 weeks after i got him, but then i noticed his crickets disapearing much faster then usual, and he was just stressed out cause he was very young but he grew out of it and got really active and ate loads, and actualy ended up escaping. what i would do with dino is let him rest and just relax for a while and dont bug him at all except to change his water and to mist the tank since force feeding would be a stressfull thing on him and making him not want to eat on his own. give this a good week or two since your last feeding so he gets a bit hungry and dangle the food infront of him with tongs and if he doesnt go for it making just poke his mouth a bit with the food and he should go for it. try with nightcrawlers, earthworms or most other worms you can get locally just stay away from mealworms and superworms and then try other foods after u get him to eat a worm or two. if he doesnt eat after the 1-2 weeks when you try id probaly force feed again. hopefully someone else comes in and helps you out cause there could be better ways to get him to eat. i hope dino gets better soon and will eat on his own!