There has been a suggestion that the attack on Tobruk planned for 21 November 41, but cancelled because of CRUSADER, contained an amphibious landing element (see e.g. this thread at the Comando Supremo forum), similar to Operation Venezia, the attack on the Gazala position in May 42 (see here for Kampfgruppe Hecker). The evidence on which this is based is a sentence in Hinsley’s British Intelligence in World War II, Vol.II, the official history.
Having looked at the relevant evidence on the Axis side, I must say I can not find anything showing such a plan. I did however find that elements of the Tobruk garrison were alerted to the possibility of such a landing on 16 November (e.g. D Squadron 7 RTR). So this leaves us with evidence from the British side that such an attack was planned, but no evidence from the Axis side to that effect.
My conclusion is therefore that this was a real British scare, but not a real Axis plan. If that conclusion is correct, I find it baffling that the British official history would repeat such a claim, given that access to German plans could have been had quite easily for the writers. But I would be interested if anyone has any evidence that this was a real plan.