Answer: It's always possible your assumption was right and someone had switched a tag at the store. So while I am not familiar with any specific squash named "Italian" there are many varieties of vining summer squash and related cucurbits which would fit that description; unfortunately you won't know exactly what type you have until it makes some squash. In general, the first flowers to set on any cucurbit are male and do not form into squash, female flowers begin to form soon therafter and will set. If you have enough zucchini otherwise and the vine is taking up too much space, you might consider removing it. I'm sorry about the mix-up, but maybe the mystery squash will be good anyway!
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