That is the correct spelling for "drummettes" (the leg-like part of the wings).
About 30 to 40 drummettes come in a 5-pound bag. It depends on how much each drummette weighs. A 5-pound bag of drummettes will feed about 8 to 10 people.
Chicken drummies usually refer to the little chicken wings that are shaped like chicken drumsticks, only smaller. They are typically made of chicken breast and part of the actual chicken wings.