can any one tell me what the metaphores in this poem refer to
I'm a ridddle in nine syllables,
An elephant, a ponderous house,
A melon strolling on two tendrils,
O red fruit, ivory, fine timbers!
This loaf's big with yeasty rising.
Money's new-mintedin this fat purse.
I'm a means, a stage, a cow in calf.
I've eaten a bag of green apples,
Boarded the train there's no getting off.