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Likely Haworthia minima?
Possibly Aloe descoingsii x Aloe haworthioides
The second is a tiny plant, forming a decent looking clump in a 2.5" pot. Small hooks on the edges of the leaves and in a single row down the center of the leaf on the top surface and slightly offset from center on the bottom. Tubercles are fairly evenly distributed on the rest of the leaf surface.
I think it might be Aloe descoingsii x Aloe haworthioides. I assume it would prefer higher light than you can get away with with many Haworthia species?