To add to Schooner man''s answer, if you have a ''coaster'' style schooner with almost equal gaff main and foresails you can also hoist a foresail top which is a triangular sail that fills the triangle between the foresail gaff and the mast head. If you don''t have floating spars on your main topsail its is simply a main topsail. If you have a big four sided sail between the main mast and the foremast, it is a gollywogger. If you have a square sail on your fore mast you have a square topsail schooner and I believe the sail is a fore topsail (not to be mistaken for a Foresail topsail).
Got all of that!