I 've looked on several internet sites which say you can eat carrot tops, in fact they are highly nutritious. But they contain an alkaloid which makes them a bit bitter and may upset the tummy of someone who is actually allergic to them. Dandelions are bitter, yet the French love them and put them in salads.
I have a horse and horses love carrot tops, so I looked that up too as Welshoinion says they are poisonous to horses. All sites said horses love them and can eat them in moderation (must be like children with sweets!) I know deer and rabbits eat them as they've stripped them in my veg garden in the past.