What type of door is Sam looking for if he desires frosted green glass panes?

In the context of door types, a panel door is characterized by its construction, which often includes multiple panels that may incorporate decorative features or materials. When Sam is looking for a door with frosted green glass panes, the panel door is the ideal option because it commonly allows for glass inserts within its framework.

Frosted glass provides privacy while still allowing light to pass through, making it a suitable choice for a panel door. The design can enhance aesthetic appeal, fitting various architectural styles and personal preferences, especially if the glass is integrated into a wooden or composite frame.

In contrast, other door types like flush doors are typically solid and do not offer the glass options or decorative elements that panel doors do. Sliding glass doors are mostly designed for seamless access to outdoor spaces but generally feature clear or tinted glass rather than frosted panels. Storm doors, designed for added insulation and protection against elements, usually consist of solid materials with either clear or screened sections and do not typically feature decorative glass options.

Thus, the combination of aesthetic, functional qualities, and the ability to integrate glass panes makes the panel door the most fitting choice for Sam's requirement.