1/10 Some of those names of chocolate bars are wonderful. The colours were of little help to me but I enjoyed some of the names, even though I've never eaten many of those chocolate bars, such as :
Payday - a big slab of a bar with more than one filling and bought as a special reward to yourself?
Baby Ruth - a round segmented choc in the shape of a baseball? A bit like a Terry's Chocolate Orange which you snap into little crescent shaped slices.
Mr Goodbar - I've read the book but not heard of the chocolate bar.
Wonka bar - a spin-off from the book/film maybe?
Oh Henry!

my middle name is shared with a choc bar, yahoo. Here's hoping it's a popular one.
Milk Duds - not a clue, could be anything.
5th Avenue - a rich dark chocolate bar at the pricier end of the market?
3 Musketeers - like a Kit Kat but only three fingers?
Whatchamacallit - Oh to go into a shop and be able to ask for a Whachamacallit.
Zagnut - I imagine this as a Lion Bar shaped item with nuts protruding beneath the chocolate coating, a rough looking bar with a good chew to it.
Krackel
- can't imagine what this could be, something that explodes in your mouth, like that Space Dust powder you had as a child? Krackel has a lively sound to it.