My friend own a beach house next door to an elderly man who is a plant hoarder. Since he has not step foot in that home for 3-years there is an entire house filled with dead plants. Can this cause a bug problem that could affect his neighbor. These are townhomes so they are right next to eachother.

There should be no reason the dead plants would attract bugs. There would be no moisture or food source for the bugs. There may be other items in the home that could provide habitat.

Does your friend have any bug problems?

That's sad, must be something unexpected happened. I agree, no food source. Isn't someone caring for the home at all?

But I do not understand the phrase "plant hoarder". I call that a greenhouse.