People get hung up on names and correct nomenclature. Although 'chinook' is the recognized official common name, the term 'springs' is used just as commonly for chinook salmon in the ocean and in freshwater, at any time of the year. In fact I dare say it is used much more frequently than Chinook salmon. Point to a fish and ask any commercial fisherman what it is and I guarantee that 99.99999999% of the time they will call it a spring salmon. Ditto for fish processors. Ditto for natives and ditto for almost any fishing report you read.
The term 'spring salmon' was originally derived to identify very early running fish (entering freshwater). If you catch a maturing chinook in saltwater in Jan., is it a chinook or a spring salmon? Either or in my opinion. In systems like the Fraser and its tributaries, 'spring salmon' are for all intents and purposes extinct from a catchability point of view since you can't fish for them before July 1 at the earliest, at which time they magically become 'chinook salmon'.
If we carry the logic of common names further, when do we (or should we) call a Pink salmon a 'humpie'? Only during the spawning phase and for only those male fish exhibiting a pronounced hump? I think not. Same for dog salmon.
There are 'official' common names for fish (for legal purposes) and there are 'accepted' common names as well. Both are just as valid in my opinion and as long as you are referring to the same species, shows no ignorance. Just my 2 cents.