Yes. The radiant energy from an incandescent solid contains an infinite number of frequencies, spread smoothly across the electromagnetic spectrum.
Work Step by Step
Atomic excitation occurs in all matter: solids, liquids, and gases. Atoms in solids/liquids are tightly packed. Their energy levels interact, and radiation from them is smudged into a broad distribution, producing a smooth spectrum. On the other hand, the radiation from widely-spaced gas atoms is emitted at discrete wavelengths. This is discussed on pages 567-569.