Does look like a spline, or a timing pulley, or a type of stub tooth gear that I am not familiar with.
Most gears are either hobbed, in which case the tooth form is "generated" in the process, or else cut with form tools on a milling machine, in which case the form tool cuts the correct form. All that really needs to be shown is the module (or diametral pitch) and tooth count.
Many times for a gearbox I will design using the OD and the pitch diameter, using the pitch diameter to set clearance for the gear center distance. The OD is useful to avoid interferences between gears or gear to housing, etc. I never bother with the tooth form etc.
Of course, for 3D printing, you may need to exactly model what you want. There are programs for generating gears and tooth forms, such as "Gearotic CAD", which can output importable templates.
https://www.gear2motion.com/