A toad can be used as a rock catalyst. Generically, the word "toad" can be used for the same reaction at other periods. While toads can catalyse in several ways, the higher-period "toads" refer to the reaction below, not anything relying on a toad having an alternating 1-cell and 2-cell leading edge; those only work with actual toads.
The reaction was long known in pairs in the form of killer toads (p2) and killer candlefrobras (p3). More recently (mostly as of 2021), singular toads have been explored more.
Two fishhooks, one toad and one fishhook, and two killer toads give three different catalyses when applied to this phase of a traffic light. (click above to open LifeViewer)
A p55 pi-heptomino hassler using the p5 and p11 toads in the first viewer on this page in "toad + fishhook" form. Of note is that the p5 and p11 oscillators are rotated 90° from the viewer above; in the form here, they fail without the fishhook. (click above to open LifeViewer) Catagolue: here