kaloula pulchra, should i be worried?

[Gnag the nameless]

I second Bombina Bob here, many frogs will hide for the first week or even month of captivity. That is entirely normal. Try not to stress out the frog. Also, I am unsure of their aestivation durations, but it may be trying to aestivate until the warmer months. Like Bob said, it may also be due to temperature and humidity. Can you post a picture of the tank?

I would still encourage trying to get it to eat, but do not dig it up unless absolutely necessary.