If you're referring to the age difference aspect of the "cougar" trope:
* A "cub" is often used to describe a younger man who is dating an older woman.
* A "toy boy" is another common term for a younger man in a relationship with an older woman, though it can have more negative connotations.
If you're referring to the aggressive nature of the "cougar" trope:
* A "wallflower" is someone who is shy and passive, often seen as the opposite of an assertive and confident cougar.
* A "homebody" is someone who prefers to stay at home rather than go out and socialize, another opposite of the typical "cougar" image.
If you're referring to the attractiveness and confidence of the "cougar" trope:
* A "frump" is someone who is unattractive and lacks style.
* A "loser" is someone who is unsuccessful and generally undesirable.
It's important to remember that these terms can be subjective and carry different connotations depending on the context.