so - if hand blown, and you can see the shears mark where the rim was cut, then it would be logical to assume they were finished by attaching to a pontil rod and thus there would be a scar or depression - but there doesn't appears to be either. A lot of later C19 glass (1850 onwards) - often drinking glasses - show signs of having been attached to the rod (usually ending up with a depression) - although those pieces were probably press moulded.
I had dismissed tumblers in view of the unusually small size of these , but having looked in the Delomosne Loan Exhibition brochure from March 2008, it appears there were such things as 'Small Sized and Miniatures' tumblers which ranged from 3.7 cms. (almost the smallest known), up to about 5.9 cms. Although small tumblers seem most often to have cut decoration. There was a lot of part moulded pieces in the late C18 and very early C19,
Assuming the bases and sides are moulded, then these are blown-moulded construction, although how they're finished I really can't explain - perhaps Peter or Neil can help.
Probably best to stear clear of referring to lemon squeezer feet, as those were made separately and then attached, whereas these 'salts/tumblers' were made as single pieces.
My best effort at date would be 1780 to 1810 or perhaps a tad later, but still unsure as to purpose - and would have thought they would 'scratch' whatever container they were in.
Sorry, really no help.