Many woods have natural scents, one that comes to mind as one of the strongest I use is the Camphor Laurel, the more sapwood in the blank the stronger the smell however, if you seal the wood with something like CA, particularly gloss/deep finishes (many coats), the scent/smell is very minor.
This is when the wood needs to be finished with oils or neutral scent wood preservers however, the finish is never as strong/durable and would require some maintenance, which would come in a form of cleaning (removing dirt, etc) and re-applying the protective oil.
As for acrylics, oh yes, you can add scent when you are mixing the resin, all depends of the strength of the scent, I tried with vanilla concentrate and with some very expensive but exquisite smell from a perfume I bough for my wife.
I use it to make a couple of pendants for the wife to use and there is no doubt, you can smell clearly what scent was used on which, the oldest is about 2 years old and I can't see that much loss of scent (just a little) from the day I finished it and most of it is due to the Polyester smell when fresh that will dissipate/disappear after a little while.
There is a word of caution though, I tested in on Polyester (PR) resin only, I can't say what the reactions will be with other types of resin also, and unless you use very concentrated stuff (only a couple of drops), pouring too much of the scented material into the mix, can produce a reaction that will either spoil the resin or, will created pockets of nothing (or very little) inside the resin when cured, pretty much as if you put some water into the mix...!
So, time for experimentations, huh...???
Good luck
Cheers
George