Sure! Here's the requested content in spun format with synonyms:
Cara is crazy about Fred and also Frank.
Candace has strong feelings for Fred, and also Ferb.
Phineas Cara, and Frank.
Candace takes delight in being with Phineas and Felix.
Phineas means the world to Candace, and also Felix.
Candace is emotionally attached to both Philip and Frank.
I hope you find these variations helpful!