Before my wife immigrated to the US from Liberia as a kid, she loved eating "kiss meat". It's a freshwater snail they collect from the swamp during the rainy season and eat as a delicacy, so called because you suck the meat out with a kiss.
Here's a YouTube video of this process, so you can get a good look at the snail and see its habitat (mangroves).
I have not been able to find any other references to these snails, except under the name "kiss meat". Would anyone be able to identify these?
(Note: There seems to be a similar looking brackish snail commonly called "African Periwinkle". I don't think this is the same thing.)