In the woods and hedgerows near my home there are many snowdrops, all Galanthus nivalis, both the single and the double (flore pleno) form. A few times I have observed a type of double snowdrop that is new to me; I wonder if it has been recorded previously? You might call it a "snowball" type because the flowers remain in a tight ball and never open.
The group in the bottom left of the picture is of this "snowball" type, whilst the flowers top right are normal doubles. The "snowball" flowers are quite small but the effect is not unattractive. Are there existing cultivars like this?