Depending on the variety you’re growing they can be extremely sweet. Like candy. This is because heirloom varieties in particular, when frozen, will convert their starches to sugars in an attempt to survive.
Most carrots sold to supermarkets or grocers are not able to do this, and they’re less sweet (but still fairly sweet, for a vegetable.).
part of the science of why we’re so keyed for sweet things… is because sweet meant it was ‘in season’.