Completely submerged in substrate

[Gobb]

Facts:
Female African Bullfrog, size of fist

What happened:
Tonight, At first, I thought she escaped. Instead, she was completely submerged under coco fiber.

Question:
Is this odd behavior? Does it indicate something, good or bad,?

[Jtb]

From what I know they burrow to cool off/avoid overheating. is the tank too warm?

[Joshheitkemper]

This is completely normal for most frogs. It could be because of overheating or some form of hibernation.

[MyKindOfLullaby]

My female african bullfrog loves to completely submerge in her substrate. I have a digital thermometer gun and always check her temps when she burrows just to make sure she isn't too hot. I think she just prefers to stay hidden.