What do you call a person who collects recipes, ingredients or other cooking related materials? Is there a name for classifications like this (like taxonomy etc.)?
While several terms loosely fit the criteria (such as a culinarian), a culinophile or reagenteur speaks more to my tastes (if you don't mind portmanteaux).
As for what one might call the group, taxonomy or classification are appropriate when ascribing the term to a family derived from a particular set of criteria. Plenty of additional terms are available in online Thesauri, if you're curious.
How about the term "culinary collector"? It seems to be both precise and general enough, while remaining straightforward and unpretentious. Additional subheadings could be inserted, such as those for literature (cookbooks, articles, essays and recipes); equipment (antique, specialty or regional); videos (cooking shows, travelogues, even historic/cultural documentaries).