White's Tree frogs upper arms are very thin

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I have a pair of White's tree frogs. They are still young (about 2 inches long or so). Their upper arms seem very thin and white. They are hunting and eating plenty of crickets. I gutload the crickets with Fluker's orange cube complete cricket diet and I dust ~2 times/week using Reptivite with D3. Are they just at their adolescent "awkward stage" where their limbs are growing faster than they can gain weight, or should I be worried about this?

I am relatively new to being owned by frogs, so I might just be paranoid. Help, as always, is appreciated!

Thanks!

White's don't have much as far as muscle in their upper arms... they are more like Popeye, they have big forearms.

Ha... "owned by frogs"