The animal that makes a tool with a stick to scrape insects from a hole in a tree or a log of wood is the **Orangutan** (Option 2).

Orangutans are known for their remarkable tool-making abilities, which include using sticks to extract insects from tree crevices or to access honey inside beehives. They have been observed using sticks as tools for various purposes, including foraging for insects and accessing food resources that would otherwise be difficult to reach. This behavior demonstrates a high level of intelligence and problem-solving skills in orangutans.

In the provided options:

- **Fishing cat** (Option 1) is a species of cat primarily found in wetland habitats. While they are skilled hunters and swimmers, they do not exhibit the tool-making behavior described.

- **Otter** (Option 3) is a semiaquatic mammal known for its playful behavior and hunting skills in water. While otters use their paws to catch and eat aquatic prey, they do not typically use tools to extract insects from trees.

- **Sloth bear** (Option 4) is a bear species found in the Indian subcontinent. They primarily feed on insects, fruits, and vegetation but do not use tools in the same way as orangutans.

Therefore, the correct answer is **Option 2: Orangutan**, as they are known for their tool-making abilities for insect foraging.