Better than nothing if I don't have anything at home or can't stomach anything else! Still, nothing that should be a habit…
In general I would say no due to the sugar crash that you would end up experiencing during the day possibly ruining it however making small sweet additions to your breakfast should be fine e.g. some fruit
sets you up for constant cravings as your insulin levels spike early. More hunger means more calories and, as your willpower wanes throughout the day, more carbohydrate-heavy comfort foods, which keeps your liver working overtime.
Of course! It's better to eat desserts during breakfast than later, during the day or at night, because sugar gives your body energy for daily activities.