Mrrzy's musing about why rowing song are not usually thought of as chanteys, led me to check the definition of the word in major dictionaries.

Definitions range from extremely specific (Chambers's 1908): "a sailor's song, usually with a drawling refrain, sung in concert while raising the anchor, &c."    (Sorry about "sung in concert": hmmm, meanings change.)

To the most general (Macmillan): "a song that sailors sing."

As for the two most prestigious dictionaries, Oxford allows wiggle room:

"A sailor's song, esp. one sung during heavy work"

that Merriam-Webster doesn't :

"a song sung by sailors in rhythm with their work"

Folklorists generally require that a "chantey" must be sung by sailors for shipboard work. If rowers are sailors and small boats propelled by oars are ships, then folklorists should consider rowing songs to be chanteys.

But they don't, because they're not. On the other hand, the teeming millions who define "sea chantey" as "any song related to the sea" would have no problem applying the word to a rowing song.

And, of course, one may speak "figuratively" too.

So that's settled....