https://www.antiquetrader.com/advertising/fire-grenades-history-and-collectability/

This article will give you some information !! Did you ask when you purchased them what they were ?? Are they blown in a single piece or do they have a seam on the sides ?? Look at the base to see if there are any identifying numbers or letters !! The glass should be thin so to be easily broken !! Green and cobalt blue are the rare colors so its always possible that they are reproductions !! Check the size,, most fire grenades are between 6 and 8 inches tall !! There were a few smaller but these are harder to find !! And its also possible that these are hand blown bud vases that may have had a wire stand or a hanging wire similar to those found on Amazon !!
Just a few things to think about and check !!