Normal for colouring to change?

[John]

If memory serves, that would be a girl based on the tympanum. Bullfrogs run the gamut, color-wise. If your eats well and is active, don't worry.

[Jace]

Oh, she eats like a horse! :-) Thanks Luke and John. She is definitely keeping me on my toes, but appears to be thriving, so I will continue to let her do her own thing.

[carlcaruana]

If she turns brown in the night... it's very normal because they do that to ''hide'' with their colour so other animals won't see them much. If she turns brown alot, then ask for some help from professionals.