This is the 138th most frequent Estonian word.
tulnud
"Tulnud" means "come" or "arrived" (past participle).
Here, 'tulnud' functions similarly as a past participle, emphasizing the completed nature of the movement.
Ei ole teada, kust ta tulnud on.
It is unknown where he has come from.
Though 'tulnud' here seems to relate to arrival in context, its general usage alongside 'olen' forms part of a structure indicating past action.
Ma olen kodutöö juba tulnud kohta andnud.
I have already submitted the homework to the intended place.
In this sentence, 'tulnud' is in its active past participle form, describing a completed action related to movement.