They do! They exist in a strange spot, but Spore Druids are a notable exception.
"Druids of this circle have a complex relationship with the undead. They see nothing inherently wrong with undeath, which they consider to be a companion to life and death. But these druids believe that the natural cycle is healthiest when each segment of it is vibrant and changing. Undead that seek to replace all life with undeath, or that try to avoid passing to a final rest, violate the cycle and must be thwarted."
