Yes. Endocrinologists are trained in disorders of metabolism which include abdominal obesity.
If pathological. Only if the abdominal obesity is due to a certain disease state (e.g., hypothyroidism). Otherwise, good nutrition and regular exercise are the best weapons against obesity. A family physician or internal medicine physician can help with exploring such options.
Sometimes. Weight loss can be tied to endocrine disorders, but generally effective weight loss depends on healthy eating. Make half your meal vegetables and fruits. Go for variety. And keep in mind that potatoes and french fries dont count. choose whole grains & limit refined grains. pick the healthiest sources of protein. Drink lots of water. Stay active.