Herbs do well inside. Lettuce might if you have a sunny enough window that does not get too hot (heat makes it bolt or flower before it produces a lot of edible leaves).
Can you do anything outside in pots? Radish, turnip, carrot, onions?
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These are called Sensory Tubs or Sensory Bins. There are lots of different themes to them, and can be custom tailored to your child's individual interests. I love the use of black beans as soil in that second link. HTH
Re: Toy flower bed?
Herbs do well inside. Lettuce might if you have a sunny enough window that does not get too hot (heat makes it bolt or flower before it produces a lot of edible leaves).
Can you do anything outside in pots? Radish, turnip, carrot, onions?