Silverstein is known for his whimsical and humorous poetry, often featuring fantastical creatures and situations. Perhaps you are thinking of a different poem or author, or the name "Griselda" may be a misremembered detail.
Could you provide any more information about the poem you are looking for? For example:
* Do you remember any lines from the poem?
* What is the general theme of the poem?
* Is there a specific book or collection where you believe the poem might be found?
With more information, I might be able to help you find the poem you're looking for.