AFAIK on a HPE OfficeConnect 1920 - R1112 software release - CLI (system-view) session only arp related commands (arp and display arp) listed below are available:
[HPE1920]arp ?
anti-attack Specify ARP anti-attack function
check Specify ARP item check status
detection Specify ARP detection function
static Static ARP entry
timer Specify ARP timer
and:
[HPE1920]display arp ?
X.X.X.X Display ARP entry by special IP address
all Display static&dynamic ARP entry
anti-attack Display ARP anti-attack information
count ARP Entries count
detection Display ARP detection information
dynamic Display dynamic ARP entry
interface Display by Interface
slot Specify the slot Number
static Display static ARP entry
timer Display ARP timer
vlan Display by VLAN
| Output modifiers
<cr>
There is no presence of any proxy-arp related command (like proxy-arp and display proxy-arp).