Reading Grimm’s Household Stories in context of fantasy in literature gives at first hand the impression of a very basic and shorthand storytelling. Every single sentence seem to give an additional meaning or further action.
In ancient times, when these (or similar) stories has been passed on by oral teaching only , there may have been relativity fixed and clear meaning to roles and symbols of the tales. As art in general was not to divide from spirituality in that further times it is to assume that the stories up from the beginning was intended to give moral examples to the listeners.
But even with some additional knowledge about pagan symbolism it is quite difficult to find the estimated hidden meaning. Maybe the pagan symbols are just remaining as narrative elements in a process of editing spoken words to a written Story. But more likely they lost their meaning quite earlier, when christian ideology starts to dominate the old stories.
After all there are different layers to discover the message of the tales and most of them are not pagan at all. Obviously there is a distinct moral inside every single story, which may have been cleaned and smoothed by the editors. But even the oral source may have passed them with an understatement of a hidden morality.
In ‚The Frog Prince‘ a picky princess gets rewarded for violating an animal. This fits perfectly to moral values of protestants, where salvation is not a matter of act but God’s ‚grace alone‘. Further in ‚The Raven‘ a failing hero comes to an happy end, by the faith of the bewitched daughter into the fate of the Prince, like ‚faith (in God) alone‘ is the protestant doctrine of justification.
So we can see, that the obvious meaning of Grimm’s Household Stories is not as ancient as the stories themselves but an kind of educational effort of both, storyteller and editor.