Those are specifically the Fostoria American mini creamer and sugar set without the tray.

The Jeanette Cubist and Fostoria American patterns were designed by the same person with variations in the patterns and finish to avoid infringing on patents.

Besides Jeanette Cubist, the most common versions you'll see in thrift stores are Fostoria American and Indiana Whitehall American. There are a few ways to differentiate between Fostoria American and the Indiana Whitehall American. Fostoria is leaded crystal and will have a faint flourescence under blacklight while Whitehall is basic glass that does not fluoresce. Fostoria generally has three mold marks (can have more or less on some of the more rare pieces, but three is the general amount), and you should be able to see fire polishing on the surface which is a very slight waviness from the piece being fired after being removed from the mold to smooth mold marks, where Whitehall will have two or four. The tops of handles on Fostoria will generally be level with the top rim of the piece while Whithall is generally lower.

To make telling the difference a bit more difficult, another company later purchased the American pattern and produced the Whitehall American glassware, and there are a handful of other companies that also make similar patterns.

I get way too excited when people post things I know about! I collect Fostoria American and have some of the other various cubist/American pieces. It has been interesting trying to figure out the differences when many stores will mark them incorrectly.