The answer as to what is allowed or not allowed into a country varies depending on the specific item, the country, and sometimes even the specific port/airport you're entering through.
The most important thing to remember is that you should always DECLARE what you are bringing in. Almost every country has a question on the entry/customs form regarding food, and generally "food" is defined as anything that you can eat - even things like snacks/candy bars/teas/herbs/etc - and specifically things like Pot Noodle!
As long as you declare it, and as long as it's not something outright illegal (eg, drugs) then the worst that can happen is that they can confiscate it if it's something that is not allowed through that point of entry. You will not be fined/arrested/denied entry/etc if you've declared it, but you could be if you do not declare it.
Specifically for Pot Noodles, I suspect you'll be fine as long as they don't contain meat. The Canadian Government's "Be Aware and Declare" website has a list of allowed food products and the only restrictions that seem to be relevant are "no goods containing meat" and no milk or milk products ("dried, frozen, reconsituted, or fresh") . I'd be fairly sure Pot Noodles wouldn't contain either of those, and even if they did I doubt it would be in sufficient quantities for them to be rejected.