That's funny - we got exactly the same three (with the middle one being very slightly iridescent): could that be an indication they were sold as set? We've had them for more than 30 years - before I made notes on where we got them from.
We also got a snail, looking similar, signed GOEBEL - so possibly the three in question here may also be Goebel, who made loads of glass figurines, many of them pressed glass.