* Blue Whale: This is the largest animal on Earth and is often simply referred to as a "Blue Whale". It's possible that the "Bluenose" was a mishearing or a misunderstanding of the name.
* Specific Individuals: Whales are not typically given names like humans, but there might be a specific blue whale, or even a whale of another species, that has been nicknamed "Bluenose" for some reason. This would be a unique and localized name.
If you have any further context or information about where you heard this name, I might be able to offer a more specific answer.