The only time I have ever seen a "sideways" font was in the two RPG Maker games, which had a VWF.
Even then, it is common for SNES games to use 12x12 fonts, which you can try all you like but you will never get to show up in a tile editor, because those aren't an even tile size (8x8 pixels).
You can try to edit the font as is, by carefully looking at each letter and finding matching parts.
But otherwise, you'd need to know ASM to use a debugger to find out how the font is stored exactly (as well as how width is determined if it is VWF) and then probably program something to rip and insert the font.
Not a beginner thing, to say.