I learned this 36 years ago at a children teachers' training seminar as follows below. Sorry, I don know how to post the tune I learned.

1.        Here Comes Jesus on a Donkey;
Riding oh so Slow.
Little Children run before Him;
Singing as they go.

CHORUS
Hosanna, hosanna, Singing all along;
Hosanna, hosanna, Jesus loves their song.

2.        People lay their coats before Him;
As He rides along.
Waving branches, loudly singing;
Hear their happy song.

SING CHORUS

3.        In God’s house their voices ringing;
Praises loud and long.
Tho’ Men try to stop their singing;
Jesus wants their song.

SING CHORUS