Sure, I can help you with that. Here is a test case generator for the given problem statement "School of Killifish".

```python
import random

def tcgen():
    # Generate values for r, c, and q
    r = random.randint(1, 1000)  # since r * c ≤ 10^6, taking a reasonable upper limit for r
    c = random.randint(1, 1000)
    while r * c > 10**6:
        r = random.randint(1, 1000)
        c = random.randint(1, 1000)
    
    q = random.randint(1, min(10000, 10**6 // (r * c)))
    
    # Generate the grid
    grid = [[random.randint(0, 2**31 - 1) for _ in range(c)] for _ in range(r)]
    
    # Generate the queries
    queries = []
    for _ in range(q):
        r1 = random.randint(0, r - 1)
        r2 = random.randint(r1, r - 1)
        c1 = random.randint(0, c - 1)
        c2 = random.randint(c1, c - 1)
        queries.append((r1, c1, r2, c2))
    
    return r, c, q, grid, queries

def format_input(r, c, q, grid, queries):
    # Format the input in the specified format
    input_data = f"{r} {c} {q}\n"
    for row in grid:
        input_data += " ".join(map(str, row)) + "\n"
    for query in queries:
        input_data += " ".join(map(str, query)) + "\n"
    
    return input_data

# Example usage
if __name__ == "__main__":
    r, c, q, grid, queries = tcgen()
    input_data = format_input(r, c, q, grid, queries)
    print(input_data)
```

This script will generate a random test case for the "School of Killifish" problem. The `tcgen` function creates a grid of random dangerousness values and a list of queries to find the minimum dangerousness value within specified subgrids. The `format_input` function then formats these values into a string that represents the input format described in the problem statement.

Adjust the parameters and ranges as necessary to ensure the generated test cases are within the problem's constraints.