No. Saw in Sefer that most Poskim hold lettuce is preferred way of Maror. Some poskim argue and say that since today's lettuce isn't sharp should use horseradish. Many use both (myself) and some poskim say they should be done separately.
while it may be true that according to the poskim lettuce is better, most Jews nowadays are descendants from European jewry. In Europe (and Russia) it was very uncommon to find lettuce, as it doesn’t last too long without refrigeration. This led to many Jews using horseradish. As pesach is the ultimate day of following minhagim and mesorah many Jews still use (plain) horseradish. Being that the poskim say it’s better to use lettuce, this led to many doing lettuce as well. But combining the 2 together doesn’t really have a basis in Halacha because ממה נפשך, if only one is maror then you aren’t yotzei by eating it with something else, and if they both are then what are you gaining…