How to draw a deer-shaped oven with ‘Grasshopper’ ?
like the picture above
Help me!

Try searching for “waffle structure grasshopper”, and you will find a lot of example definitions and tutorials for this sort of thing.
if this is not a starter project to learn grasshopper then you might find rhino with history enabled fulfilling such simple tasks pretty fast.
I am obligated to do with Grasshopper
no problem, its probably a good starter project.