Ollie Hopnoodle's Haven Of Bliss
But it's not Ralphie, it's his brother Randy that utters the whine. When they have a picnic after the car overheats on the way to the cabin.
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In the episode 'The Courtship of Stewie's Father' (UK Season 5/US Season 4), Brian sings it to Peter in an attempt to cheer him up, but the orginial 'It's Peanut Butter Jelly Time' was sung by a dancing banana. You can watch the original flash cartoon version here: http://www.albinoblacksheep.com/flash/banana.php. You can watch the Family Guy version on Youtube by typing 'family guy peanut butter jelly time'. then when stewie was traveling back in time. stewie went back in time where brian sang the banana song. then sang it t peter instead of brian.
Popcorn and Cinnamon
Stewie sings in several episodes, "And the Weiner Is", "Ocean's Three and a Half", "Petergeist", "Emission Impossible", "Road to the North Pole", "Road to Rhode Island", a deleted scene from "Lois Kills Stewie", that's all I can think of off hand.
I am not sure but I think you are looking for Monsters vs. Aliens. Bob was a blue jelly creature featured in that movie and voiced by Seth Rogan.
"Jelly Roll Morton" (1885-1941) had the birth name Ferdinand Joseph Lamothe. Some of his recordings bear the name "Ferd Morton".