Answer:
What body part is pronounced as one letter, but written with three, only two different letters are used?
Canine children.
Santa shakes his belly like a bowl full of me
I have feathers that help me fly; with head and body but I'm not alive. Very skinny and a fixed length how far I go depends on your strength.
I am heavy forward, but backward I'm not. What am I?
I flow from the Homerβs mouth when he sees doughnuts.