What do you call a small grand piano about 5 feet long?

What is a small, lightly armed patrol boat called? What small nonflowering plant has types called hair cap and peat? A small one is called a cascade and a large one a cataract. What are they? What small oval gland at the base of the brain is called the "master gland"? What is a small porch or steps leading to the entrance of a house called? What word names a small quantity you might pat on with a finger? What word names a small shrub and the surname of Reagan's vice president? A small slave girl named Topsy appears in which novel?