As a direct description of their appearance I agree with @PPH, however as @DialFrost points out, there are other levels of understanding.
An artist is likely to refer to any changes (and just the changes) to the standard speech bubble as "Decorations", and any consistent set of decorations as a "Style".
The writer might additionally refer to individual styles as "Indicators" or "Modes", but it's more common for the artist to simply read "character X yells help" and apply the yell style, which consists of the three spikes decoration, with the text help, with the tail pointing to character x.
