Answer: According to the Central PA Poison Center, tomato plants are not poisonous to children. If ever you have a question about a possible poisoning, please call your local poison control number right away! They are open 24 hours. They can tell you immediately if there is something to worry about and what to do.
Please teach children not to eat ANYplant unless an adult says it's okay. Many common plants are poisonous -- and even if the plant is a vegetable and it is not poisonous in and of itself it may have been sprayed with something that is poisonous. You just never know.
With regard to plants poisonous to animals, you may find this Cornell University site helpful http://www.ansci.cornell.edu/plants/plants.html but again, vigilance and a call to the veterinarian are very important.
I'm so glad it was okay this time.
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