Swiss roll and ganache hungry caterpillar

[glorious]

I want to make a hungry caterpillar cake for DD'S second birthday at the end of the month.

I made a yule log over Christmas and
it got me thinking that a plain swiss roll covered in dyed white chocolate ganache would be far more delicious than sponge and fondant.

But do you think it would work? A quick google suggests it is possible to dye ganache, and I've seen buttercream swiss roll caterpillars, but not both together. And how would I do the head?

I'd make the ganache with white chocolate (needs more choc and less cream than a darker choc one), and dye it - or have a brown caterpillar!.
I'd also whip the ganache slightly before filling the swiss roll.
Don't see why it wouldn't work.
Face... No idea. I have no artistic ability!

You can definitely dye white choc ganache. I find it's easiest with powder colours rather than gels or pastes, but they all should work.
For the head, if you want a 3d one, I'd probably use rice krispie treats (rice krispies and marshmallows mixed together) to mould the shape, then cover it either in chocolate (dyed white choc) or fondant.

You can always make a chocolate sponge and fill with whipped ganache THEN cover in fondant (that's how I always do choc cakes).

Thanks both, that's encouraging. I'm not sure I'm up to sculpting from rice crispies! I'll get some powder colours as I only have gel and I want the best chance of success.

For the face id melt some chocolate pour it into something the same size as the end of the Swiss roll pop it out, then decorate smarties for eyes writing icing.......