I think there are many types of ants, living in different habitat. In Thailand, I hear that some of the big ants live in
trees, and harvesting the eggs can be painful. (I think they use a very long stick to get to the nest, and ants fall down on them).
I hear in Colombia they eat ants in the cinemas, instead of popcorn, apparently it's quite big there. I've tasted giant toasted ants once, and they are not my thing, not really bad, but not satisfying, and with quite a dodgy taste. On the other hand, I have sampled, directly in nature, bid red ants in Asia, and on hot days, they can be quite refreshing, as they taste acidic, a bit like a lime/lemon. I even hear that a danish company called "Nordic Food Lab" was thinking about creating a sort of lollipop with different spices and insects, and one was called the "chimp stick", where one of the ingredients are "lemony" ants.
But the eggs are something special, and I've heard about some french cook in California, in some trendy restaurant, who had to smuggle them from Mexico (called there "escamoles"), and had to have special contacts and connections just to buy them at some very high price. In Asia it's a bit easier and cheaper I think...
And yeah, would be great to find a way to harvest those ant eggs!
Another source of fat are waxworms, and those I hear can be quite easy to "produce". They are a pest invading some bee-hives, and live on
honey. I have tried those as well, and they are a also very satisfying (read: full of fat), and, if the waxies have just been eating, they taste of honey as well. And they don't bite, and you can eat them whole (with grasshoppers for instance you need to remove wings, legs and sometimes the head), they are just smooth and soft and tasty. Mealworms are now quite trendy to eat, but honestly not good in my opinion.
Talking about worms... I've heard about some crazy dish they eat in Sardinia, Italy: it's a cheese, called cazu marzu, full of live larvae of the cheese fly. You can only buy on the black market. You are supposed to eat the cheese with the live grubs, but there's a bit of a problem: they can leap 15 cm, so you need to cover the bread and cheese with your hand while bringing to your mouth... Or alternatively, put the cheese in a paper bag, and close it to suffocate the grubs, and as the jump and bump against the bag to try to escape, they make this popping noise, and which will eventually stop.
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Unfortunately difficult to find, very seasonal (only 1 or 2 month/ year in the area I was), not that cheap. I'm quite sure this stuff is not for everyone, the eggs, coming from big ants, taste a bit like brie or something haha, something I miss as I don't eat dairy.
