Do Venus Fly Traps, Yellow Trumpets, sundew plants and pitcher plants give seeds?

Answer 1

Yes they do and here is an ExpertVillage video on how to propagate carnivorous plants through seeds.
Good Luck and have fun.

http://homegarden.expertvillage.com/videos/carnivorous-plant-propagation-seeds.htm

Answer 2

Yes, after the plant flowers (thin tall stems that grow out of the top) there are tiny little seeds that you need to collect and plant. Goodluck