AN UNBIASED VIEW OF TOON ME A RIDDLE

Issue: What operates but never ever walks, includes a bed but in no way sleeps, a mouth that hardly ever speaks, and also a head that never ever weeps?138. I come in a number of shades And that i get more substantial Once i’m whole. I will float away in case you don’t tie me down And that i is likely to make a loud sound if I split. What am I?F