Okay, so I watch anime. I’ll admit it. Why? It’s fun. It also helps me on certain things. So, today I was watching Naruto Shippuden. In the episode, I heard Chiyo-baa use an h sound, in a word where I’m used to it sounding like an f. I forget the word. Also, I’ve noticed, in other anime, it also does it (usually by the older generation). In しろくまカフェ,  I remember Panda-kun was talking about his new スマフォ. He said it with a fo sound. His mom said it with a ho sound. Panda-kun then proceeded to yell at his mom about it being fo not ho. So, my question is, are f’s and h’s interchangeable in Japanese? I know that the only true f sound is ふ, and the others are just a modified ふ・フ.

どうも。