Well, polarizing it might be but I'm just going to give you a few pointers:
a) the shorter the name for your website, the better.
b) the name should be memorable.
c) it should imply some sort of concept or personality central to your business.
d) "deadgrandmacookies" is not the best name because visually, it's hard to distinguish the different words due to length and lexography. Also (more importantly), the emphasis for the reader is on the first concept "dead grandmas" rather than on food, so you're strongly suggesting that the topic is grandma-related, rather than food related. The first thing that jumps out should be a positive message, and related to your topic.
e) choose a maximum of two words, like your "food baby" example.
f) if you're on a budget, one strategy is to research keywords related to your cooking topic, and try to register a website name that is also a main keyword. This allows you to "own" that topic much more easily on Google, Yahoo searches, etc. Example: "Food Baby" would be a great website for baby food (the word order doesn't matter).
TOP GOAL FOR BRANDING: If you have a larger budget, a short, invented word is the ultimate goal in branding your product - generic names can not be trademarked, so your concept can easily be copied. It's harder to get started, but in the long run a unique, branded name is the best if you have a budget. Example: QUANTAS is a made-up word (acronym) for an airline brand, it's short, memorable and suggests luxury, which is important to their core customer base.
Hope this helps! Cheers - J