Is Pulla often pronounced Bulla? Kiitos!
If you mean the Finnish word pulla (‘bun, coffeebread’), I think it can be pronounced as ‘bulla’ only if you have a flu or rarely in some Finnish dialects. According to Kielitoimiston sanakirja, the Finnish word bulla means also ‘papal bull’ - https://en.wikipedia.org/wiki/Papal_bull.
Finnish pronunciation does not make any great difference between b and p (in fact, b does not exist in the language), so p may sound b, it depends... and vice versa.
Does 'pulla' ever mean 'buns' as in backside? My Gram said that word with GREAT disgust in the 1960s when she caught me tanning face down in a too-small bathing suit.