Hi thanks for the PM. The names I gave you for Nicholas/Mary were all I could find. I can't see a David. I have given you the ref details so you can browse through the records yourself, I have also given you the entry refs for other children born in Snettisham from about 1815 to 1835. It is a long slog, but I suggest you start at page 1 and record all refs to Dodman you come accross. Do the same for marriages. You may like to do the same with Fring.
I've checked the Snettisham parish registers for baptisms.
I can't find a David
275 William 7th Jan 1821
342 Ann 2nd Feb 1823
422 John 4 Sep 1825
505 Avis 6 Jan 1828 (bad image, looks like Avis)
593 Elizabeth 17 Oct 1830
I did not find a Nicholas birth but found a death 7 Jul 1832
Norfolk parish regs are available on line. Bring up the new Family search site.. https://www.familysearch.org/... scroll up to list of countries
sroll up to England Norfolk Parish Registers, click Browse images
scroll through parishes to click Snettisham
select Baptisms/mariages/deaths then date required
there are also children to Thomas/Mary Laws and William /Christine during the same period
Refs for Thomas 90/140/171/209 and 272
Refs for William 275/342/422/505 and 593