Yes, according to the provided reference, ice cream is considered a thin liquid.
While this might seem counterintuitive given ice cream's solid or semi-solid state when frozen, the reference lists it alongside examples like water, coffee, and milk. This suggests the categorization is based on properties the substance exhibits under certain conditions (e.g., when melted or partially melted).
It's important to note that "thin liquid" is not a scientifically precise term. Viscosity, a measure of a fluid's resistance to flow, is a more technical way to classify liquids. Ice cream, even when melted, tends to be more viscous than water or milk, but it still flows and takes the shape of its container, thus fitting a general, non-technical description as a "liquid," even a "thin" one when compared to, say, honey. The term's relevance likely pertains to ease of swallowing, consumption, or processing, depending on the context.