A friend recently bought me my first frog, (a young Hylarana Erythraea) and he hasn't eaten since I've had him...

Today is the fourth day I've had the frog and I'm wondering if something is wrong...

My friend gave me some crickets to feed him, but he doesn't seem all that interested in them. (Perhaps he would prefer something else? or they're too big for him? Though, they seem rather small to me...)

I've changed out the bedding in his tank, I keep misting to keep humidity up etc., and I have a UV night bulb for him...

Any ideas or suggestions would be greatly appreciated! I'm not sure if something's wrong with the little guy...