Crab (as Zodiac sign)

Does it make sense to use Crab for Zodiac sign instead of Cancer? With this respect does the phrase 'I am a Crab' make sense???

If you said "I am a Crab" without context, I would probably think that you meant that you are crabby (in a bad mood). If you said it in the context of a conversation about zodiac signs, I wouldn't know what it meant because I don't know much about zodiac signs. I've never heard of Crab, but I have heard of Cancer.

thanks for your opinion, Hotdog! I hope to get some other replies.

"Дай краба", в России так моряки здороваются...