The most commonly known type of bee that can't fly is the worker bee in certain species, particularly during specific circumstances such as during the late stages of their life or if they are physically impaired. However, if you're looking for a bee that is anatomically unable to fly, the drone bee, which is the male bee, may also sometimes be unable to fly well, especially if they are not fully developed or are affected by external factors.
That said, there is a specific type of "bee" known as the bumblebee larva that cannot fly at all since it hasn’t matured into an adult bee. Furthermore, a species known as the stingless bee also has variations in wing sizes, and some populations may have individuals that do not fly well.
Lastly, there are several species of social insects often referred to as bees that may not fly easily, like some cuckoo bees or certain ground-nesting bees, especially if they are disturbed or not healthy.
If you meant a more metaphorical or humorous context, a "bee" that can't fly could also refer to a concept, tale, or joke. Let me know if you're looking for something specific!