First Mentioned: IPTSF Text 5
Sawhorses are Mount Units used by Goodminton. They look like horses with saws in place of their snout or muzzle.
Wanda uses sawhorses as her mounts. She names one Funnyface and another Uggymug.
Sawhorses take one turn to pop in a Level 4 City.
Sawhorses seem to have calm temperament.
Sawhorses are likely not very pretty since Wanda name her sawhorses "Funnyface" and "Uggymug" (Ugly Mug?).
Real World References
Its name refers to a beam with four legs used to support a board or plank for sawing. They also look like horses with faces like Sawfish, adding another dimension to the pun in their name.
A sawhorse was magically animated in L. Frank Baum's second Oz book, The Marvelous Land of Oz, keeping in theme with the Oz references in Book 0.