Gang Pak in Los Angeles?
By Googling, I see that it is "assorted fresh vegetables & soft tofu in red or green curry with coconut milk and thai basil."
Looking at the menu for Palms Thai I see:
"Vegetable Curry --Mixed vegetables: bamboo shoot, mushroom, bell pepper, carrot, celery, baby corn, napa cabbage, and broccoli in coconut milk red curry." or
"Red Curry -- Red curry with coconut milk, bamboo shoot, basil leaves and your choice of beef, pork, chicken or tofu."
So is it possible that we just call it Red curry, green curry or vegetable curry?
on the east coast it is always a noodle dish, made with wide flat rice noodles. A friend of mine who lived in Thailand has told me that Gang generally means curry, which would certainly make more sense with what you found. But that is still not the dish I have eaten back east....