No, longer wavelengths do not travel faster. The speed of a wave is determined by the medium through which it propagates, not the wavelength itself. In a given medium, such as air or water, all waves travel at the same speed, regardless of their wavelength.
The speed of sound in a medium depends on the properties of that medium, such as its density, temperature, and elasticity. In general, in a medium like air, the speed of sound decreases as the temperature decreases. However, the wavelength of a sound wave is inversely proportional to its frequency, not its speed. So, as the frequency decreases, the wavelength increases, but the speed remains the same for a given medium.