The frog is a four-legged amphibian, whose strong hindlegs make it a renowned jumper; it’s classed as a reptile by heralds. The frog is a period charge, found in the canting arms (Italian rana) of di Cagaranis, mid-15th C. [Triv 103]. The category includes the heraldically indistinguishable “toad” (termed a crapawd in Randall Holmes’s Roll, c.1460): toads are found in the arms of Repley, c.1520 [DBA3 439].
Both frogs and toads are tergiant by default, as in the illustration. Frogs sejant are also found, in the canting arms of Frosch, 1605 [Siebmacher 210].
Ailís inghean uí Ruairc bears: Argent, three frogs vert.
Karl Ulfson bears: Argent, a frog sejant affronty azure.
Hieronymus de Hansworst bears: Sable, a frog salient to sinister argent.