RaPattyPamPam?

Ok, scratch that. It's probably too much from the French version...

Yes. French version. In English, it could be either "PattyPumPumPum" or "ParumPoppyPum"...

There's a carol called Pat-a-pan which could work: "Pat-ty-pop"?

for more ideas and is considering those mentioned... We'll figure it out!

Umm, mebbe somethin' with popcorn?

that would work... my right brain is working in the background (I think)

the only things occuring to me are also the Drummer Boy/Pat-a-pum-pum

that keeps creeping into my mind, too