The choices above are great. If you can't find those, a very good simulate for creosote is Kreso Dip. It has something of the creosote smell and helps with bugs, which is part of the reason hogs like to rub against creosote.
You can also just add it to your old power line poles if they have dried out.
get ya couple toat sacks dip em hang so hogs can rub on em. found few trees were yhe hohs been rubbing. as DNS stated hogs get covered in flees, ticks, chiggers, & such. one reason the wallow in mud in warmer weather, the other is ta cooldown. best wishes