We know druid can
Starting at 2nd level, youthey can use yourtheir action to magically assume the shape of a beast that youthey have seen before. Youthey can use this feature twice. YouThey regain expended uses when youthey finish a short or long rest. YourTheir druid level determines the beasts you can transform into.
So, we know druids can use Wild Shape to turn into an animal they have seen before. The question: Does this have to be the full shape of an animal, or can it be part of a beast's form?
(For example, a 16th level druid wants to obtain flight, so they turn their arms into wings)
(Another example, a druid uses Wild Shape in Wild Shape to partially transform into a horse mixed with a giant rat)