Basically if you want to sample them, go buy some pixy sticks, throw in a dash of menthol and snuff the contents. Most of the major brands put out a non tobacco snuff. I don't have any otherwise I would send you a sample.
The only one I have is the Mentholin, I don't care much for it, strange scent to it. The coffee thing is there like boobah204 says, but it is an odd scent overall. I may revisit it in a couple of months to give it another shot.
I also got the mentholin and found it underwhelming. I understand green tea can be prepared and used as a snuff. Namrata mentioned that various herbs are snuffed medicinally in India. I would love to hear more about those. For me, a snuff is worthwhile if it is enjoyable to use and produces some kind of euphoric feeling. Sadly the commercial offerings in this category do neither for me.