Talavera or Falavera

Can anyone tell me if Ts in the past looked like Fs sometimes? I've not
noticed it before but then again I don't have many ancestors with surnames
beginning with a T. I've come across an ancestor with what looks clearly
like Falavera, but in a sibling's record is written Talabera. This is from
the early 1800s. Thanks for any feedback.--Raquel