Well done Endrick.
"Shuck" is one of the dreadful American words !
shuck [ʃʌk]
n
(Life Sciences & Allied Applications / Biology) the outer covering of something, such as the husk of a grain of maize, a pea pod, or an oyster shell
vb (tr)
1. to remove the shucks from
2. Informal chiefly US and Canadian to throw off or remove (clothes, etc.)
[American dialect, of unknown origin]
shucker n
It is not ENGLISH
If exuva / exuvae is too scientific in context then surely LARVAL SKIN is better than SHUCK
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