ok i can't silktouch the cake and the npc's as far as i can tell can only interact with their surroundings and not just create something out of nothing (and for thoose who are looking for seeds talk to the farmers -> special and ask for help you will get some ^^)
Ah, just found a little site with some guide to the mod. It seems you first need a child (so marrying one of the npc) and that child has the feature to tame animals then.
Not sure how it is with links here, if needed (and allowed) I can post the link to the website I found.