If a fish has a boxy shape with two small horn-like appendages on its head, what type of fish is it likely to be?

The description of a fish with a boxy shape and two small horn-like appendages strongly aligns with characteristics of a cowfish. Cowfish belong to the family Ostraciidae and are known for their distinct, cubic body shape which can appear somewhat angular or box-like. The two horn-like structures on their heads are distinctive features that help to easily identify them among other fish types.

In contrast, flatfish, such as flounders and halibuts, have a flattened body and a more asymmetrical appearance, which does not match the boxy description. Clownfish are generally characterized by their bright colors and patterns, along with a more streamlined body shape, and do not possess any pronounced horn-like appendages. Swordfish, known for their elongated bodies and a long, flat bill, exhibit none of the features described, making them an unlikely candidate. Thus, the cowfish is the correct identification based on the shape and appendages described.