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In this second paper of the Hawaii SCUBA-2 Lensing Cluster Survey series, wecross-match SCUBA-2 maps with 3 and 6 GHz images from the Janksy-VLA FrontierFields Legacy Survey for three cluster fields, MACS J0416.1--2403, MACSJ0717.5+3745, and MACS J1149.5+2223. Within the HST coverage, 14 out of 44 850$\mu$m sources have 3 GHz counterparts, five of which are also detected at 6GHz. The 850 $\mu$m flux densities of these detected sources span from 0.7 to4.4 mJy after correcting for lensing amplification. The median redshift of thesample is $z = 1.28^{+0.07}_{-0.09}$, much lower than the typical redshifts ($z= 2-3$) of brighter submillimeter galaxies in the literature. In addition, wefind that our sources have lower dust temperatures than those of the brightersubmillimeter galaxies. This is also confirmed by an analysis of the ratiobetween infrared star formation rate and 850 $\mu$m flux density. However,these 14 sources may not represent the general submillimeter population at thesame flux range, given that the SCUBA-2 sources without radio counterparts arelikely at higher redshifts. Detection of these sources would require deeperradio images or submillimeter interferometry.

The Hawaii SCUBA-2 Lensing Cluster Survey: Radio-detected Submillimeter Galaxies in the HST Frontier Fields