All Can Be Radicals
Every component in 誕 can serve as a radical, at least according to certain sources, such as Nelson.
The four components are 言, ノ, 廴, and 止. As you know, 言, the “word” radical, is “on duty” here. Here are examples of kanji in which the other components serve as radicals (again, according to Nelson):
ノ is the “kana-no” radical (simply called no in Japanese), as in 乂 (KAI, osa(meru): cut grass), which isn’t a Jōyō kanji, and in 乃 (DAI, NAI, sunawa(chi), no: accordingly, possessive particle, whereupon), which is in the list of Jinmeiyō kanji used for names.
廴 is the “stretching” or “long stride” radical (called ennyō, innyō, or innyū in Japanese), as in 延 (EN, no(biru): to stretch, lengthen).
止 is the “stop” radical（called tomeru in Japanese), as in 止 (SHI, to(meru), to(maru): to stop) and 正 (SHŌ, SEI, tada(shii): correct, justice).