From ErfWiki

Proposed Canon

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.

Speculation

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.