What does the raised bed soil consist of? Is that mulch on top? How's the drainage? How much rain did you get? Looks like they survived the frost ok, but you are right, they are very small. Are they possibly rootbound? What did you transplant them from, and how long ago?

At the very least that plant needs a good dose of fertilizer. Like Ed said that soil looks awfully wood chippy. If it is like that throughout then much of the nitrogen in the soil is locked up by the decomposing wood chips.

Lots of rain, especially in poorly draining soil, quickly leads to yellowing of leaves and the root rot that develops in overly wet soil can lead to stunted plants.

If it were my bed I'd mix in a good dose of of a dry nitrogen fertilizer throughout the bed and see if things didn't improve quickly.

Dave

Here is a link that might be useful: Growing Tomatoes forum here