That's OK if the context makes clear more or less what you are talking about, and that you don't mean something dramatically different, say like a live kangaroo. If there is any risk of misunderstanding then you should describe it more fully.
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yellowstarstruckis this natural or is there a clearer way?It sounds natural to me. To make it clearer you can say "stuffed kangaroo" or "toy kangaroo". Adding "at the souvenir shop" sharpens the description even more.