  Narrow line Seyfert 1 galaxies (NLS1s) usually do not host relativistic jets
and the detection of their $\gamma$-ray emissions is rarely reported. Evidences
for strong relativistic beaming effect have been found in all $\gamma$-ray
NLS1s to date and hence their jets are believed to be closely aligned. In this
work we perform a systematic analysis of 7-year {\it Fermi} Large Area
Telescope (LAT) data of 18 steep radio spectrum NLS1s (S-NLS1s) and report the
{\it first} two detections of $\gamma$-ray emissions in this class, increasing
the total number of known $\gamma$-ray NLS1s to 9. A strong and stable
$\gamma$-ray signal (over 8$\sigma$) is produced by SDSS J144318.56+472556.7,
and a significant $\gamma$-ray emission (4.5$\sigma$) of SDSS
J130522.74+511640.2 has been detected in a monthly flare in November 2013. A
thorough investigation of their multiwavelength properties from radio to X rays
has been performed, finding no significant variability. Along with their
spectral energy distributions and the radio morphology, these facts strongly
suggest that these two sources harbor mis-aligned and possibly underdeveloped
relativistic jets, which provides valuable targets to reveal the formation and
evolution of relativistic jets under extreme circumstances.
