What kind of stone is it? You can name if from the stone.
Alabaster, African wonderstone, alberene, and softer kinds of serpentine are not uncommon for small carvings/sculpture.
The Alabaster Zoo has a nice sound to it.
Limestone and sandstone are also popular for smaller carvings. The Limestone Zoo is not as 'pretty' perhaps as others, but facts are facts.
Marble, travertine, and onyx: the preferred stone since the time of classical Greece. The Marble Zoo would have the benefit of a 'classical' sound to it.
Granite is an extremely difficult stone to work. I doubt your zoo is made of granite, but if it is, The Granite Zoo is appropriate.
Finally you can use metaphor to name your zoo. Michelangelo has some hauntingly unfinished sculptures named the slaves because they are not free of their stone blocks. Your zoo is frozen forever in stone, prisoners, unseeing, etc. You can use a metaphorical name, e.g. The Frozen Zoo.