Yes, we know of galaxies of various sizes, ranging from small dwarf galaxies to large galaxies. Here are some examples:
Small galaxies:
Dwarf Spheroidal Galaxies: These are small, faint, and low-mass galaxies that lack significant amounts of gas and dust. Examples include the Fornax Dwarf, Sculptor Dwarf, and Draco Dwarf galaxies.
Irregular Galaxies: Irregular galaxies have irregular shapes and often exhibit ongoing star formation. They can range from small to large sizes. The Large Magellanic Cloud and the Small Magellanic Cloud are examples of small irregular galaxies.
Large galaxies:
Spiral Galaxies: Spiral galaxies are characterized by a disk-like structure with arms extending outward. The Milky Way, our own galaxy, is a large spiral galaxy. Other notable examples include the Andromeda Galaxy (M31) and the Whirlpool Galaxy (M51).
Elliptical Galaxies: Elliptical galaxies have a smooth, elliptical shape and lack the spiral arms seen in spiral galaxies. They can range from small to massive sizes. The largest known galaxy, in terms of mass, is the central galaxy of the Abell 2029 galaxy cluster.
Lenticular Galaxies: Lenticular galaxies have a combination of characteristics of both spiral and elliptical galaxies. They have a disk-like structure but lack prominent spiral arms. The Sombrero Galaxy (M104) is a well-known example of a large lenticular galaxy.
It's important to note that the classification and size of galaxies can sometimes be subjective and dependent on the criteria used for classification. Our understanding of galaxies continues to evolve as astronomers make new discoveries and refine their knowledge through observations and research.