There are a few Dr. Seuss fonts that are used throughout the books. According to this, One Fish, Two Fish, Red Fish, Blue Fish's font is Filmotype Major. I don't know any of the others. Dr. Seuss' fonts are a little less distinguishable than, say, Disney's font, but you know it when you see it. If you can freehand it, go right ahead and freehand the letters on the arrows for this Seussville sign.