young convert

(LXX). Metaph., as subst., , , , : .† newly planted a new convert neophyte novice ὁ ν. I Ti 3:6

nieuweling

(lit: newly-planted), newly converted to Christianity, recent convert.

new convert

newly planted, i.e. (figuratively) a young convert ("neophyte")

novice

νεό-φυτος, -ον (νέος, φύω) [in LXX: Job.14:9, Psa.144:12, Isa.5:7 (נֶטַע), Psa.128:3 (שְׁתִל)* ;] newly planted (LXX). Metaphorical, as subst., ὁ ν., a new convert, neophyte, novice: 1Ti.3:6† (AS)