Froelich is a lunar impact crater on the far side. It is located in the northern regions, just beyond the north-northwestern limb. Only a few kilometers separate this formation from the crater Lovelace to the north. Farther to the south is the crater Merrill, and to the southeast along the limb is the larger Brianchon. (wikipedia entry)
A crater is a circular depression likely created by an impact event. On the Moon they are named after deceased scientists, polar explorers, astronauts or cosmonauts.