A useless creature that is formed when a balrog mates with a lobster, resulting in a lobster beast with flaming feeler (palp) which effectively cooks their own body. This is ironic because they can only utilize these flaming feelers when out of the water (their natural habitat) at risk of cooking themselves, additionally that means they are not effective in battle in their natural habitat as they cannot utilize their flaming feelers. Thus a lobrog can be defined as someone who is very useless.
Tim: Have you met that new kid Fay?
Ben: No but I hear he is a total Lobrog.
Harry: Yeah he is the most useless kid I know.