because it rhymes with Grug. 因为跟阿瓜谐音

389. I can fix it.
     我会弥补的
390. This works good.
     感觉真好
391. - What do you call it? - I was thinking of calling it a 'hug',
     -这叫什么 -我考虑把它叫作拥抱
392. because it rhymes with Grug.
     因为跟阿瓜谐音
393. But you can change it if you want.
     不过你想叫它别的也可以
394. No, no, I like hug.
     不 我喜欢拥抱
395. I love you.
     我爱你

来自《疯狂原始人 第二部分 The Croods Part2》第 392 行