Σαρκωθέντα, σταυρωθέντα, and πλανηθἐντα are aorist passive participles (masculine singular accusative) of the verbs σαρκόω, σταυρόω, and πλανάω respectively. In other words, those forms are verbal adjectives, and modify a singular masculine noun in the accusative case. The nominative forms would be σαρκωθείς, σταυρωθείς, and πλανηθείς, all based on the verb's last principal part, the aorist passive. The aorist passive participle in Greek corresponds to the English passive participle ending in "-ed" (having been incarnated, having been crucified, having been led astray).