Interesting. Teething, yes, but we've never noticed a link between that and growth spurts, though we haven't really paid that much attention, so it definitely could explain it.
You know, ds1 has had gross poops lately. He just had a giant growth spurt. I thought it was because he's been eating lots of applesauce etc but maybe there is something to your theory!
He has always pooped MORE when growing for sure, because he is eating more.