Digimon are people. Ken likes Nara'a already.

"What's that mean?" Wormmon asks, but he asks Ken instead of, you know, the person who would have more information. Fortunately, Ken is patient, and was listening carefully.

"He can change abilities, like Armor Evolution."

"Ooh." Wormmon is suitably impressed, and that helps him remember his manners. He bows. Or, well, bobs his lil head, and his antennae wiggle. "Thank you."