Is 媆 commonly used in modern Chinese?

No, 媆 is a relatively rare character in contemporary usage, more often found in classical or literary contexts.

What is the difference between 媆 and 嫩?

Both can mean 'tender' or 'delicate,' but 嫩 is more commonly used in modern Chinese, while 媆 is more archaic and literary.

It is possible but less common, as the character carries strong connotations of softness and femininity. It is typically used in girls' names.

媆Tone 3

ruǎn ｜ 12 strokes ｜ radical:

Soft, tender, delicate — describes a gentle, soft, or tender quality, often used to describe youth, texture, or demeanor.

Soft, tender, delicate — describes a gentle, soft,

Soft skinTender personalityDelicate textureYoung and tenderGentle voiceTender leaves

The character 媆 carries connotations of youth, gentleness, and delicacy, often associated with feminine qualities.
It is a relatively rare character in modern usage but can be found in classical or literary contexts.
In naming, it may be chosen to evoke a sense of softness, grace, or youthful innocence.