I don't think so, if it's that funny French r. I've had to sing songs in French before, but sung French apparently just uses a regularly trilled r. Because the other would probably impede the voice or something like that.
TPBM has accidentally answered the phone in a goofy way before, only to find out it an important person was calling. (My brother did this yesterday. He has also pretended to think that one of my friends was a pizza company and tried to order pizza when she called.)