毛毛虫的英文是caterpillar还是carpenterworm

毛毛虫的英文是caterpillar还是carpenterworm

都可以的，毛毛虫Caterpillar(s) / carpenterworm(s)。只是前者用的多一些。
caterpillar
[英][ˈkætəpɪlə(r)][美][ˈkætərpɪlə(r)]
n.毛虫; 履带; 履带拖拉机;
复数：caterpillars
1.A caterpillar is the larva of a butterfly.

毛虫是蝴蝶的幼体。
2And caterpillar was duped into thinking the company was worth much more than it actually was.
卡特彼勒公司被骗相信年代煤矿机电公司具有很高的价值。
3A caterpillar changed into a butterfly.
毛虫变成了蝴蝶。

caterpillar

都可以的，不过前者比较常用一些（后者比较学术一些）~
例句：
毛毛虫吃这种植物的嫩叶。
Caterpillars eat the young leaves of this plant.
我看见一条毛毛虫在叶子上.
I saw a caterpillar on the leaf.
毛毛虫必须经过茧的阶段才能变成蝴蝶.
A caterpillar must pass through the cocoon stage to become a butterfly.
毛毛虫变成了蝴蝶。
The caterpillar was transformed into a butterfly.
看那只毛毛虫正在吃你的苹果。
Look at the caterpillar eating your apple.
交通就像毛毛虫一样在蠕动!
The traffic just moves like a worm!
毛毛虫最终将蜕变成蝴只一蝶。
The caterpillar will eventually metamorphose into a butterfly.
毛毛虫可以变成蝴蝶。
Caterpillars turn into butterflies.