John Gill Commentary Matthew 21:11

"And the multitudes said, This is the prophet, Jesus, from Nazareth of Galilee." — Matthew 21:11 (ASV)

And the multitude said
Or the people, as the Vulgate Latin, and Munster's Hebrew Gospel read; the common people, that went before, and followed after him: these knew Christ better than the inhabitants of Jerusalem, the Scribes and Pharisees, and rulers of the people.

This is Jesus the prophet :
that prophet Moses spoke of, in (Deuteronomy 18:15) and the nation of the Jews in general expected:

of Nazareth of Galilee ;
who, though he was not born there, yet being educated, and having lived much in that place, is said to be of it; and which was the common opinion of the people.