Noun: story, tale, fable, anecdote, yarn.
Tarina comes from a Russian word, старина, which means ”antiquity” or ”old man.” [If you are a Russian speaker and can tell more on how these words are related, please leave a comment.]
Let’s translate the whole phrase, ”jokainen kuva kertoo tarinan,” ”every picture tells a story.”
Jokainen is an indefinite pronoun meaning ”every.” (It can also mean ”everyone” or ”everybody.”)
Kuva is a noun which means ”picture,” ”image,” ”photograph” or ”photo.”
Kertoo is the 3rd person singular of the verb kertoa, which means to tell.