問了一下Grok, 童子雞為：

"童子雞" in English is "spring chicken" or "young chicken." It typically refers to a young, tender chicken that hasn’t fully matured, often used in cooking. In some contexts, especially informal ones, "spring chicken" can also mean a young or inexperienced person, depending on how it’s used.

For example:

• 烹飪上： "A dish made with spring chicken"（用童子雞做的菜）。
• 俚語用法： "She’s no spring chicken"（她可不是小丫頭了，意指年紀不小了）。