Hi Marco,
Which Countries?
I've the two Brigade Games Pac War US Marines Flame throwers, of which, one is a character. The No2 is carrying a can of gasoline - Nice minis. I can get you a photo if we have fine weather today.
Battle Honours usually have a flame thrower in their W2 ranges under support weapons. You can e-mail them an ask. I usually do under the relevant code.
I'm sure there are others so I'll go away and think about it.
Ciao,
Helen