I think that by definition “toys” include just about any object that a child can make use of to engage his/her imagination and learn about him/herself and his/her environment.
It doesn’t have to be confined to traditionally accepted toys like a ball or a doll. Even items commonly found around the home like cardboard boxes, pebbles, bottle caps, articles of clothing, etc. can be the catalyst for exploration and experimentation that fascinates the child and that he/she can learn from.
In my opinion, as long as the item is age appropriate (e.g.; not a choking hazard, a sharp object, toxic chemical or fire hazard) there’s not much to worry about.
As for spiritual dangers from reading materials, that’s a much more complicated issue than I can respond to.