Calf

仔

zǎi

(young deer, elephant, seal or whale (also used of some other animals))

小牛

xiǎoniú

(young cow or bull)

牛犢 /牛犊

niúdú

(young cow or bull)

犢 /犊

dú

(young cow or bull)

腓

féi

(muscle in the back of the leg below the knee)

腿肚子

tuǐdùzi

(anatomy: back of the leg below the knee)