Strange front wheel noise

Hi, I am having an irritating sound coming from my right side wheel at low speeds 0-15 mph and it repeats every revolution of the wheel. Now the only way I can describe the sound is by comparing it to the grunt or Snort a pig makes, (serious) if anyone remembers the show "Green Acres" then they will know the sound "Arnold" the pig made while watching TV and that's the closest I can describe it. It sounds exactly like it but with kind of a hollow plastic tone to it. I'm not talking a squeal sound but a Snort Snort sound. I was hoping someone knows what I'm describing as I have looked on many forums and videos. Straight steering wheel, low speeds, and in rhythm with front passenger wheel rotation. 1990 4runner automatic locking hubs, all stock. Thanks!

 

When was the last time the hubs were greased? And have you checked for rubbing?

 

The Hubs I have not greased. No rubbing. I will be jacking up the front to inspect further as soon as the ground dries. Thanks.