<unk> refers to harsh upper airway sounds, classically inspiratory
A minimal amount of edema or inflammation in the pediatric airway can result in significant obstruction and can lead to rapid decompensation
Stridor 
Laryngotracheomalacia
Dysphagia
Accounts for 60%
Black hairy tongue
Usually exacerbated by viral URI
Paronychia
Dx w/ flexible fiberoptic laryngoscopy