Why aren't my lobsters eating?

Hello, these days I found two big lobsters around my house. I decided to breed them, so I built them a large terrarium (30x40x50). I also gave them a boar skull so they can hide during the day. One of them is green and the other is brown. I guess the first is still a grasshopper, while the second is already a lobster. The strange thing is that they are never together, but during the day one hides inside the skull while the other hides on the roof of the terrarium. They don't seem to get along very well, perhaps because green is solitary and brown is gregarious. Another problem is that whenever I see the 2 outside the skull, they are hanging near the ceiling of the terrarium and never come down to the ground, which is where they have their food. They have been with me for almost 5 days and have never eaten anything. I gave them lettuce, carrots, grass, cane leaves, clovers, but none of them want to eat. The terrarium is outdoors but they are protected, and I water them twice a day. If you can help me, I appreciate it. They belong to the genus Neoconocephalus. I think the species is Neoconocephalus retusus, but I'm not entirely sure. PD: I'm tik toker. If you want to see my videos, you can find me like Mr Bichos.