home made napalm (petrol and styrofoam) isnt a stick "bomb" as such, a bomb has an activation device, like a fuse or some such, so napalm is just a fuel, the stuff that burns. a bomb is also supposed to explode.
a sticky bomb is one that can be planted to a surface and defy gravity. hence the 'sticky' part.
i can understand the confusion though of napalm, because it is an extremely sticky substance, that it might be a sticky bomb.