I know this is late, but I have a few more lines to the "Hiawatha's Childhood" song, my Mother used to sing it to me

Hushabye my little owlet
Many voices sing to thee
Hushaby the waters rushing
Hush replys the old pine tree

Ta whoo, Ta whoo, Ta whoo (spelling on this part is iffy at best!)

Sorry this is all I can remember and my dear Mother passed on a few years back. I was looking for more lyrics to this myself.

Sincerely,