Let me make sure I understand what you are wanting to do here. If you are referring to " cloaking " the physical blogger's blog affiliate link they give you, you can't cloak that directly due to it being on their hosting servers and actually a subdomain of their site.
If you are referring to " cloaking " the links to your blogger's blog in your submissions, you can do that with a simple text link, " click here to read my blog ", for example and hypertext it for your blogger's blog url.
If you are attempting the first of these two scenarios, I would have to ask why you'd want to do that when you can simply move your blog over to an independent website and host it yourself with any of the outstanding blog software that is out there. Not to mention that having a blogger.com blog is an incredible way to get yourself search engine ranking if you simply add your homepage as a permalink for it.