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I came across this TVS diode: https://m.littelfuse.com/~/media/electronics/datasheets/tvs_diodes/littelfuse_tvs_diode_smf3_3_datasheet.pdf.pdf

It has a forward voltage drop of 10 to 15 V. Why? How? That is so unusually high. What kind of diode has that kind of a drop? Isn't it always roughly between 0.2 and 0.7 V?

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It's often several volts because the forward voltage is measured at a very high current (for the size of the diode). It's a bit unusual for the forward voltage to be higher than the revese voltage, but it is possible for a small diode.

Here's a more detailed curve from a larger TVS (from the same manufacturer):

enter image description here

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