>>55352838Rabbits are also digitigrade when not at rest. Saying a rabbit is plantigrade is like saying cats are plantigrade because they often rest on their heels or ankles. It's just not the case.
Can't really speak to the basilisk lizard in particular. Other lizards use plantigrade foot posture when moving across granular surfaces, so it wouldn't surprise me if basilisks are only plantigrade runners when running across water. But I can't find any decent sources on this one way or the other.