If there was a conviction for fraud in the United States and that same conviction is one for which there is an equivalent charge/conviction in Canada it could very well make you criminally inadmissible to Canada.
Without the exact details of the charges, what the conviction was, in what state, the exact charge, and so on it's not possible to determine if there is something that equates in Canada.
You are, regardless, required to provide the details on any application made which includes one submitted in writing or when seeking entry to Canada at any border of convictions. Failing to do so can result in misrepresentation charges or issuance of a removal order from Canada.