Hi
Had a quick look at the Baptisms for Beccles 1813-1865, there was no sign of any Shickle's
I note (from freeBMD) that the births occurred in the Mutford district, Beccles is in the Wangford district.
Couldn't find any Shickle's in Lowestoft St. Margaret's baptisms around those dates either.

Does the 1861 census give their place of birth?
yokel