The phrase "frozen in" can refer to being stuck, immobilized, or trapped in a particular situation. There are several synonyms that can be used to describe this feeling, such as "fixed," "entrenched," "firmly established," "rigid," or "immovable." "Trapped" or "confined" can also be used to describe the feeling of being frozen in a particular place or mindset. Additionally, the phrase "locked in" can also be used as a synonym for "frozen in," particularly when describing a feeling of being unable to escape from a particular situation or circumstance. In summary, there are several different words and phrases that can be used as synonyms for "frozen in," depending on the context and specific situation being described.