  This paper presents multiwavelength photometric catalogues of the last two
Hubble Frontier Fields (HFF), the massive galaxy clusters Abell 370 and RXC
J2248.7-4431. The photometry ranges from imaging performed on the Hubble Space
Telescope (HST) to ground based Very Large Telescope (VLT) and Spitzer/IRAC, in
collaboration with the ASTRODEEP team, and using the ASTRODEEP pipeline. While
the main purpose of this paper is to release the catalogues, we also perform,
as a proof of concept, a brief analysis of z > 6 objects selected using
drop-out method, as well as spectroscopically confirmed sources and multiple
images in both clusters. While dropout methods yield a sample of high-z
galaxies, the addition of longer wavelength data reveals that as expected the
samples have substantial contamination at the ~30-45% level by dusty galaxies
at lower redshifts. Furthermore, we show that spectroscopic redshifts are still
required to unambiguously determine redshifts of multiply imaged systems.
Finally, the now publicly available ASTRODEEP catalogues were combined for all
HFFs and used to explore stellar properties of a large sample of 20,000
galaxies across a large photometric redshift range. The powerful magnification
provided by the HFF clusters allows us an exploration of the properties of
galaxies with intrinsic stellar masses as low as $M_* \gtrsim 10^7M_{\odot}$
and intrinsic star formation rates $\mbox{SFRs}\sim 0.1\mbox{-}1M_\odot/\mbox
yr$ at z > 6.
