What's an "Oyster Rabbit"?

[JoeH]

$tevie wrote:
Pretty ironic that you try to mock Biden for saying "Oyster Rabbit" when in fact he said "Oyster Bunny". He had a slip of the tongue, whereas you made a mistake.

Considering how I have heard Easter (mis)pronounced by people depending on where they grew up, I could even see it coming from that instead of being a slip of the tongue.