What to do with coughing sneezing kids in the stand or house

Isnt there some kind of caller or something you can buy that you can get kids to sneeze cough into and it makes amuffled deer sound or something? Some guys told me about it a few years ago but I cant find it. Any other ideas? I have my 10 year old girl and 13 year old boy this weekend of Alabama youth hunt and both have been sick. My son always seems to need to sneeze. He has allergies and you know how dusty etc shooting houses get. Nothing clears a field like a damn sneeze or cough in my experience. They seem conditioned to know that sound like they are with a bow string being released. Cell phone going off, dropping shite anything else etc and they tense up but sneeze or cough they are gone gone gone. Any help appreciated. It is my duaghters first hunt and she is intent on killing a deer because her friend-enemy killed on last year.