Miniature or dwarf Black Cherry?

I was recently browsing the OP tomato plant selections at different nurseries. While most of the plants were twelve to fourteen inches tall, one nursery had a selection of fully developed, but short plants about four inches tall. I bought two Black Cherry plants from the shorter varieties and planted them on March 7. Other tall plants I purchased on the same day have doubled in size in two weeks. The Black Cherry plants have only grown by 25%. I'm wondering if I may have purchased a patio or miniature variety of Black Cherry. Anyone familiar with a miniature Black Cherry variety?

Ted