Just in case you're buying into his BS. A "stigmatic tropolator" is not a recognized term in any academic field, including biology, physics, or linguistics. The phrase appears to be a nonsensical combination of two unrelated concepts.
Dahl is a genius and BSL level 7 scientist. Just accept it and deal with it. He is my favorite poster on this site. Never heard him type an unkind word about another individual. Very lovely words about Jane. Im sure her dad is smiling and blushing. Perhaps he should join their family circle. You would know what a stigmatic tropolator is if you ever took cytosomatic embryonic quantum nuclear endocrinology.