No, Spectrum doesn't support SNMP Polling over TCP.
The following RFC 3430 document describes that SNMP over TCP has experimental status.
Based on RFC 1157 (https://tools.ietf.org/html/rfc1157), SNMP is using UDP. UDP has the following advantages:
1. UDP does not carry overhead as TCP, therefore it would not consume higher bandwidth when compared to TCP
2. UDP is faster than TCP because UDP does not order packets
3. UDP is a connectionless protocol and may be termed unreliable but SNMP doesn’t require reliability as each request generates a response. In the event where SNMP does not receive a response, it would issue the request again
As the time this article is written, enabling SNMP Polling over TCP is not supported by Spectrum.