Yes, Lion Stout is classified as a Tropical Stout. I've been working on trying to duplicate it for the past 4 years, with 2 dumpers, 1 decent attempt, and then there's this year's version. I don't have my recipe notebook with me, but for a 5G batch, I use chocolate malt plus C60 and 120, but no roast barley. I also add a little honey malt. Mash at 153-154. I do add 8oz. molasses, but no lactose. I also add 4oz. cherry extract during late fermentation. This year's experimentation was to use Perle, Citra and Moteuka hops to get some 'tropical fruit' flavor. Bottled it this past weekend, and it tasted pretty good. If it carbonates and conditions well, I'm thinking of submitting it to the Longshot competition. It's just odd enough that Jim K. might appreciate it, if it ever gets that far.
If you're really interested, Revvy on the HBT forum has a thread from 4-5 years ago that talks about his attempts and research into Lion Stout.