I think they are lovely birds. However, you have to be really careful ascribing a particular piece to a particular glass master without a signature - and then you need to convince your self it is an original signature, and look at all the other features, colours, techniques, etc.
Masters and studios always talk about how their figures, water fowl, fish etc are inspired by the wild life they see around them in the beautiful Venice lagoon. However, i collect mid-20th C Murano, especially birds and fish and although some of them are stunningly beautiful - I certainly can’t be certain what species of bird quite a few of them are. OK, some are straightforward but a lot seem to involve a lot of artistic license.
In this case you can be certain they are somerso, you can be very confident they are Murano, both by the look of them and the label.
However, the label points away from Seguso and I can’t see an exporter peeling off a Seguso label to replace it with a generic studio art label.
The colours look more modern than I would have expected for Archimede Seguso, but it’s hard to tell in a photo.
I have visited Murano to research the source of some of my un-labelled collection - and found just one furnace making the exact same pattern, but with different colours. It does not help that a kind of retro fashion is popular in Murano now and there are many furnaces making very similar patterns and colours to those made in the 50’s.
What I also saw was how many furnaces are making near identical pieces making it impossible to trace a given piece back to a given studio without some other verification like a certificate, signature, or very distinctive technique.
So I would be reluctant to confidently describe your ducks as Archimede Seguso or even as Seguso when there are several elements of doubt.
I would confidently describe them as beautiful Murano, somerso, ducks, probably Mid to late 20th Century, and celebrate their beauty for what they are.