At the end of the Train; quest for the trolly

After leaving the other compartment with her information on where to find the food trolley, J. J. managed to make it down the train without any incident.
Her mouth began to water when she spotted a kind older woman help children purchase food from her trolley.
"Can I help you dearie?"
J. J. smiled at her kindly, "Yes, please, I'd like..."
She trailed off as she stared at the food in front of her. She didn't recognize any of it.
Of course the food would be different here, why wouldn't it be?
She picked up a package that read chocolate covered frogs. They weren't real frogs were they? Surely wizards didn't eat real frogs.
"What would you like dearie?"
J. J. looked at her helplessly. She didn't know.
Would she ever stop feeling clueless?