I don't know if they need yoghurt but my daughter does like them occasionally.
I freeze the little yoghurts with a plastic spoon in the end (gives them something to hold) and give it to DD that way. She loves it and it's a nice treat for a hot day. Be warned though if you do this it is very very very messy.
and if you don't want to spoon feed at all then you can wait until your ds has some spoon control and give him a nice thick yogurt, which is a good thing to start with. My dd is 10mo and can get a few spoonfuls in herself provided I load the spoon.
My 7 month old has a frozen frube occasionally. Probably has lots of sugar etc in, but on the odd occasion I dont mind. She had them frozen when she had tonsillitis and she loved them. So I now keep a pack in the freezer and give her one when teething. She can then hold it herself, but is still getting yogurt, no spooning needed. Although we are not actually doing blw, but thought it might be helpful
I give DS thick Greek Style yoghurt sweetened with fruit puree but I tend to spoon feed him it He does love it though, and he is very clear about when he has had enough! He does have his own spoon as well which he uses to feed himself as well as me feeding him.