I have been doing a bit of researching - some basic ideas to work on
The fish is for putting candy or pebbles into and the closest I can get is 'Blenko' or 'Viking' (& other USA companies) - these have fins holding them up and mine does not have a pontil. knowing USA companies influences I would say this is Scandinavian or Italian.
The second vase seems to come up 'Zwiesel', I have photos in recent publications, usually we think of Zwiesel as having bubbles but they did many simple cased vases - this is very much one of their colours and the shape close?
Third vase is a shape I associate with 'Gullaskruf' designed by 'Arthur Percy' perhaps - similar to the 'Randi' vase but without the lines.
The decanter remains a mystery - Blenko did a version but the body was round - again this takes us to their infancies - in this case I think Scandinavian - it does have a pontil, I have checked 'Kosta' with no luck.
Just some thoughts - probably wrong, well I hope I am proved wrong with a positive ID