While you may have unlocked deviants like Digby Boy, Electric Eel, Lethal Rabbit or Fetch-A-Lot Bunny, you will also need the Buzzy Bee in Once Human and this is the location where you can find and capture him. This creature is a farmer and he can be found in a hidden chest
How to get Buzzy Bee into a human
The location where you can find Buzzy Bee in Once Human is Dayton Wetlands (coordinates: 5709, -5222) near Citrus County. Go there with your motorcycle and see if you can spot this anomaly.
If not, it is recommended to change the world at a teleportation tower, come back and see if the Buzzy Beed has spawned. Look for a pumpkin farm and the bee should be floating in a sphere above it. Be prepared to take out some enemies in the area.
Here's another location on the map where you can find the Buzzy Bee deviant, near the Sutherland Family's orchard.