Kog'Maw Move Speed
Kog'Maw has a base move speed of 325 (one of the lowest of all ADCs). Item wise he gains 45 flat move speed from Berserker Greaves, 5% from Triforce and 7% from Runaans. This totals out to 415 move speed and an additional 10-30 from Rage (Triforce passive).
CC wise, Kog'Maw doesn't really have any. One can argue that E slow is substantial (base move speed * (1-% MS reductions)) but turns out to be negligible due to it being maxed last. Maxing it last means that Kog'Maw doesn't have a reliable CC source for disruption. Statistically it is negligible due to the condition of the advancing champion. If we restrict champions to ADCs we can eliminate some variables. Typically ADC obtain double crit and Berserk Greaves which would end up being (325+45)(1+.5)(1+.7)(1-.20) = 332 at rank 1 and 207 at rank 5 (but due to the soft-cap on MS reduction is comes out to be 214). 214 is very slow but this excludes any gap close and extra move speed from passives/actives. Might I also add that E lasts for slows initially for 1 second and persists for 4 seconds. An additional slow is applied after leaving the zone for .25 seconds. The ooze is easy to avoid because of its awkward execution and is typically misplaced.
Every ADC (besides Kog'Maw and Urgot [ though many would argue he is no longer considered an ADC]) has some sort of Move speed buff or debuff. Whether that may be a skillshot, point and click, trap, or dash.
