Are immigrants from south of the USA who have been declared criminals?
No you will not be granted entry, you will be denied and turned back or deported to your country, If you do not declare what country you are from or provide documents you could end up sitting in a jail until you can be identified, and that could take years, even if you are released pending a hearing in court you will not be issued a sin card, meaning no work, no health care, I dont even know if you could get a drivers license, technically you will not be recognized by the government. Unless you get your criminal recorded pardoned in the USA I dont even suggest going near the border. You would have to have a really really really good refuge clame and at that in the last 20 years no one from the USA has been granted asylum in Canada, the USA is considered a safe country, and as far as the walking across a non port of entry loop hole in your case with the criminal record the out come would not be what you are looking for