No, the smallest known star is not bigger than the Earth. Stars are significantly larger than planets, including the Earth. The smallest known stars, known as red dwarfs, have sizes that are slightly larger than gas giants like Jupiter but significantly smaller than the Earth.
Red dwarfs are the most common type of star in the universe and are relatively dim and cool compared to other types of stars. They have a mass range of about 0.08 to 0.5 times the mass of the Sun and can have radii of about 0.1 to 0.6 times the radius of the Sun. The radius of the Sun is approximately 109 times that of the Earth, so even the smallest known stars are still much larger than our planet.
To put it in perspective, the Earth's radius is about 6,371 kilometers (3,959 miles), while the smallest known red dwarfs have radii on the order of tens of thousands of kilometers.