Do you guys have a hide cave or box in the cage? I recently got a small pixie frog and mine was also burrowing in the shop and screaming when I got him out for feeding the first days I got him but I provided him with half a coconut shell with an opening as a hideout and now he sits in there with his head sticking out all day waiting for food to arrive. I think he's male since I think I heard him croaking a couple of times. He's still small now though so I'll have to look for a bigger hide box soon. They're ambush predators so they always try to stay in cover. Mine is also most active during the night though I think, he sits mostly in his hide spot during the day but i always find earth in his water bowl in the morning so he must have been walking in there