Yes, it is generally okay to put wet clothes in the dryer even if it's not full of other wet clothes. Dryers are designed to handle both small and large loads, so it is safe to dry a few wet items on their own.
However, keep in mind that drying smaller loads may take longer and be less energy-efficient compared to drying a full load. The drying time can be extended because there are fewer clothes to absorb the heat and moisture, which means the dryer may run for a longer period to achieve the desired dryness. Additionally, running the dryer for smaller loads can be less energy-efficient since a significant portion of the energy is used to heat the drum rather than being utilized to dry the clothes.
To optimize energy usage and save money, it's generally recommended to dry full loads whenever possible. If you have just a few wet items, you might consider air-drying them on a clothesline or drying rack instead, which can be a more energy-efficient option for small loads.