Agreed. While there may be a specific term for stock promoters that engage in pump and dump schemes, the general term "pump and dump" does not have a specific connotation and anyone that attempts to artificially increase the price is engaging in pumping and therefore a "pumper." For example: Pump-and-dump is an illegal scheme to boost a stock's or security's price based on false, misleading, or greatly exaggerated statements.
Referring to Wikipedia:
And while that blurb uses the term stock promoter, don't be misled into thinking it has to be a paid stock promoter hired by insiders or anything like that. It is just the term used to refer to the person pumping, which can be a third party recommending stocks on a website, just like in this SEC complaint: