gefroren

(class-2, intransitive, strong) to be cold, feel cold [auxiliary haben] (unlike English freeze neither informal nor expressing extreme cold.)
(Southern, class-2, dated, impersonal, strong, transitive) to be cold, feel cold
(class-2, impersonal, intransitive, strong) to freeze, be freezing, be below 0 degrees celsius
(class-2, intransitive, rare, strong) synonym of gefrieren (“to freeze, become hard through cold”)